Unit 7 What's the highest mountain in the world?单元语法填空训练（含解析）2023-2024学年八年级英语下册（人教版）

Unit 7 What’s the highest mountain in the world
单元话题语法填空练习
（23-24八年级上·浙江金华·期末）阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。
They eat wild animals, plants, berries, nuts and insects (昆虫). They hunt with bows and arrows (弓箭). There are lots of dangerous snakes and spiders. It’s one of southern Africa’s hottest 1 (place), and there is often no water. Then they have to get water from plants. When they are ill, there are no hospitals. The people have to get medicine 2 plants too.
They are the San, the last people living in Kalahari. The San people have another name—“Bush People”. Their lifestyle is very simple 3 they know more about animals and plants than most people do. The San people live in small groups of 25—50. They live in huts-little “houses”. These houses are made of wood and 4 (grass). There are no schools for the children. Children learn from the older people in the group. They know many wild life skills so 5 can live in a dangerous place like the Kalahari. In the evenings, the group of people often sit around a fire and tell stories 6 (happy).
The Kalahari is a big area of bushland in the southern Africa. It has two parts. There is 7 (little) rain in the southern part than in the northern part, 8 the south is drier. There are fewer plants and animals there, and it’s more difficult for people 9 (live). But when it rains at the end of the summer, the land becomes greener and more beautiful. For 10 few weeks, there are millions of little flowers and even butterflies!
（23-24八年级上·湖北恩施·期末）Animals are our friends. We share the same world with them. But many kinds of animals are in danger for many 11 (reason).
Blue whale is one of them. They are the largest animals in the world. They mainly feed 12 the smallest animals in the ocean. Now they are in danger because 13 (they) living environment (环境) is getting bad. First, some people make their ocean home dirty. Second, some people kill them 14 their meat. Third, there is more and more man-made noise in the sea. It 15 (make) it hard for blue whales to talk with each other. Because of these, the number of blue whales is becoming smaller and 16 (small).
Sloth (树獭) is another one. They are the world’s 17 (slow) moving animals in the world. They mainly live in South America. They are funny, 18 lots of people like them very much. Sloths spend so
much time 19 (stay) in the trees. They are also in danger because people cut down too many trees in the forest. Sloths will have no place 20 (live) in if we don’t do anything for them.
Now it’s time for us to do something to protect them.
（23-24八年级上·江苏泰州·期末）Dolphins are stars in aquariums (水族馆). They bring a lot of joy to people. 21 dolphins are not happy living in aquariums. A study shows that dolphins in aquariums live much shorter than 22 (that) in the sea. They die of 23 (ill) at a very young age.
24 (luck), a company in the USA is there to help these dolphins. It has made robot dolphins. The robot dolphins not only look but also move like real ones. 25 a test, people thought they were real dolphins. “The robot dolphins can swim and dive 26 (they) ,” a worker in the company said.
One robot dolphin costs about $ 27 million. Now, an aquarium in China 27 (think) about using them instead of real dolphins.
To save the sea animals, the company says it will keep on 28 (make) other different kinds of robot animals, such as sharks and seahorses, in the future.
We look forward to 29 (watch) the shows from robot animals. Thanks to the company, more and more sea animals will go back to the nature and live 30 happy life.
（23-24八年级上·浙江丽水·期末）阅读下面短文，在空格处填入一个适当的词或使用括号中词语的正确形式填空。
There are many ways to grow a garden. But if you want to have a beautiful garden, you will need to think about many things 31 (careful).
Does your garden get enough sun That’s 32 (important) of all. Most plants need a lot of sunlight 33 (grow) well. And you’d better put compost (堆肥) to make the soil (土壤) rich enough.
Is it easy to water the plants 34 your garden Plants need water to grow strong 35 stay healthy. Usually, the rain waters plants, but sometimes the garden 36 (get) dry because there is not enough rain. You need to keep water nearby to solve 37 problem.
What else do you need to take care of your garden Think about 38 (animal), like rabbits and squirrels. They will probably get into the garden and eat your plants, so you need to make a fence (篱笆). It can help keep 39 (they) away from your garden.
Finally, don’t 40 (forget) that growing a garden is simply about having fun. You enjoy growing it,
looking after it, and best of all, eating all the great food from it.
（22-23八年级下·山东临沂·期末）阅读下面短文，在空白处填入一个适当的单词或括号内单词的正确形式。
For the whole year, I waited for the summer holidays to start all the time, because I would visit my 41 (uncle) family in India. My cousins were waiting for me. Finally I reached there 42 June 9th.
In the evening when we were discussing what to do the next day, my uncle advised us to visit an elephant sanctuary (保护区). We were so 43 (excite). I love elephants.
The place was not far. The bus ride only took half 44 hour. My uncle 45 (visit) it already, he said it used to be a great palace (宫殿). 46 I got in, I feared that the elephants might stamp (踩) on me, but soon I got relaxed. I saw a cute baby elephant. Then many more came over. Some elephants 47 (take) a shower while others were resting under the trees. The guide told us that there were 49 elephants. They ate mostly palm leaves (棕榈叶). Each took about three bundles (捆) of palm leaves at a time.
My cousins and I fed the elephants and took lots of 48 (photo) of them. Soon we had to leave. On our way home, we kept 49 (talk) about the visit happily. Later that night I dreamed of playing with elephants. It was truly an 50 (usual) journey in my life.
（22-23八年级下·浙江杭州·期末）阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
Yellowstone National Park is 51 US national park which was built in 1872. It covers about 9065 square kilometers and is one of 52 (large) parks in America.
Yellowstone is widely seen as the first national park in the world and it is famous 53 its wildlife. Native (土著的) Americans 54 (live) in the Yellowstone for at least 11000 years. There were some visits by mountain men during the early-to-mid-19th century. Later, the U.S. Army began to protect the park and tried hard to make it 55 (peace). In 1917, the National Park Service (国家公园管理) built 56 (hundred) of buildings there. Now, these buildings are 57 (real) important for the study about American history.
Some people don’t know 58 to do in the Yellowstone when they pay their first visit. Actually, there are many fun activities in the park, such as hiking, 59 (camp) and sightseeing. Everybody could find something interesting to do there. So it is really a good choice for us 60 (take) a trip to the Yellowstone National Park.
（22-23八年级下·山东枣庄·期末）阅读下面短文，在空白处填入1个适当的单词（冠词、连词、情态动词）或括号内单词的正确形式。
The Great Wall of China is a very long wall that people built over many years. It lies in northern China and covers a distance (距离) of over 13,000 miles, making it 61 (long) wall in the whole world. People built the wall to protect 62 (they) from their enemies.
The building of the Great Wall 63 (start) over 2,000 years ago during the Qin Dynasty. The emperor of that time wanted 64 (keep) China safe from enemies. Later on, during the Ming Dynasty, people worked together to rebuild and improve the wall.
The Great Wall is not just a wall for protection, 65 it is also a cultural treasure. It 66 (show) the hard work of the Chinese people who built it over time. The Great Wall is 67 amazing example of how cleverly ancient Chinese people built a very long wall, and it also reminds people that Chinese people worked together and never gave up.
Millions of people from all over the world 68 (visit) the Great Wall. They came to see how amazing it is and enjoy the wonderful view. 69 the Great Wall is very old, it is still a wonderful part of China’s culture that people 70 enjoy today. We are proud of the Great Wall.
（21-22八年级下·浙江金华·期中）阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。
Beth Moon is a photographer 71 the US. She likes to travel around the world and take photos of old trees. By doing so, she wants people 72 (protect) and value these old trees.
Moon began taking photos of trees twenty years ago. At that time, she lived in England. She saw 73 old yew(紫衫树) in the countryside. After that, she 74 (fall) in love with trees. Till now, she 75 (be) to ten countries to take photos of those old trees. The job was not easy, but Moon loved it. To take the 76 (good) pictures, she always needed to plan ahead(提前). “I have to 77 (careful) think about the best season to take photos of each tree. Most old trees grow in special places. There are few people 78 there is less pollution. We can only go there at certain times of the year,” she said.
Later, Moon’s book about 79 (she) photos came out. There are sixty black-and-white photos in the book. Each one of them is special and they take readers in the 80 (wonder) world of trees.
（21-22八年级下·浙江台州·期中）Many people think that the dinosaurs were the biggest animals that ever
lived. They are wrong. The world’s biggest animal is still 81 (live), and it lives in the sea. It is called the Blue Whale. Blue Whales can be as long as 33 meters 82 they weigh as much as 181 tons. The largest dinosaur weighed only 60 tons.
The whale is not only the world’s biggest animal, but it is also one of 83 (clever) animals. We know that whales can communicate with another, although we do not know what they are saying. One day perhaps we will learn 84 (talk) to whales, and then they will be able to tell us about 85 (they).
There are lots of stories 86 whales, and maybe the most famous one is called Moby Dick, which was written by the American writer, Herman Melville. He spends a lot of time 87 (do) research on whales. In this story, a sailor-Captain Ahab makes an effort to kill 88 very big white whale named Moby Dick. 89 (sad), there are not many kinds of whales left. People have killed them for 90 (thousand) of years for food and other things. However, there are now laws to stop people killing most kinds of whales, so perhaps there will be more of them in the years to come.
参考答案：
1．places 2．from 3．but 4．grass 5．they 6．happily 7．less 8．so 9．to live 10．a
【导语】本文主要介绍了卡拉哈里沙漠的地理情况以及当地居民的生活状况。
1．句意：它是非洲南部最热的地方之一，而且经常没有水。分析可知，此处考查“one of + 最高级 + 名词复数”结构，表示“最……之一”，所以空格处应用名词复数。故填places。
2．句意：人们也必须从植物中获取药物。根据前文“there is often no water. Then they have to get water from plants.”可知，此处应是指药物也得从植物中获取。故填from。
3．句意：他们的生活方式很简单，但他们比大多数人更了解动物和植物。分析可知，空前后存在转折关系，所以应用转折连词but。故填but。
4．句意：这些房子是用木头和草建造的。根据“and”为并列连词可知，空格处应填一个名词，grass表示“草”，为不可数名词。故填grass。
5．句意：他们知道许多野外生存技能，所以他们可以在像卡拉哈里沙漠这样危险的地方生存。分析句子结构可知，句子缺少主语，结合“They”可知，空格处也应用they。故填they。
6．句意：晚上，这群人经常围坐在火炉旁，开心地讲故事。根据空前“tell stories”可知，空格处应填一个副词。故填happily。
7．句意：南部的雨水比北部少，所以南部更干燥。根据“than in the northern part”可知，此处表示比较，所以空格处应填形容词比较级。故填less。
8．句意：南部的雨水比北部少，所以南部更干燥。根据前文提到南部的雨水比北部少可知，“南部的雨水比北部少”是原因，“南部更干燥”是结果，前后存在因果关系。故填so。
9．句意：那里的植物和动物更少，人们更难以生活。分析可知，此处考查it's + adj. + for sb. to do sth.“做某事对某人来说……”。故填to live。
10．句意：在接下来的几个星期里，有成千上万的小花，甚至还有蝴蝶!根据空后的“few weeks”可知，此处是指几周，a few表示“一些”，后接名词复数。故填a。
11．reasons 12．on 13．their 14．for 15．makes 16．smaller 17．slowest 18．so 19．staying 20．to live
【导语】本文主要讲述了蓝鲸和树獭成为濒危动物的原因，呼吁大家保护动物。
11．句意：但是许多种类的动物由于许多原因处于危险之中。many后接可数名词的复数形式，所以空格处应填名词reason“原因”的复数形式，故填reasons。
12．句意：它们主要以海洋中最小的动物为食。feed on意为“以……为食”，故填on。
13．句意：现在它们处于危险之中，因为它们的生活环境越来越恶劣。根据空后的名词短语“living environment”可知，空格处应填they的形容词性物主代词their“它们的”，故填their。
14．句意：其次，有些人为了它们的肉而杀了它们。根据“kill them...their meat”可知，此处表示为了它们的肉而杀死它们，介词for“为了”符合语境，故填for。
15．句意：这使得蓝鲸很难相互交流。根据语境可知，时态是一般现在时，主语It表示单数，所以谓语动词make应填第三人称单数形式，故填makes。
16．句意：由于这些原因，蓝鲸的数量越来越少。结合提示词和“smaller and”可知，本题考查“比较级+and+比较级”结构，意为“越来越……”，所以空格处应填形容词small“小的”的比较级，故填smaller。
17．句意：它们是世界上移动最慢的动物。结合提示词和“in the world”可知，此处应用形容词slow“缓慢的”的最高级形式，故填slowest。
18．句意：它们很有趣，所以很多人都很喜欢它们。分析“They are funny...lots of people like them very much.”可知，后句是前句的结果，空格处意为“所以”，故填so。
19．句意：树懒花很多时间待在树上。spend time doing sth.“花时间做某事”，结合提示词，空格处应填动词stay“待”的动词-ing形式，故填staying。
20．句意：如果我们不为树懒做点什么，它们将没有地方住。分析“Sloths will have no place...in”可知，空格处应填动词不定式，作定语修饰名词place，结合提示词，空格处应填to live，故填to live。
21．But 22．those 23．illness/illnesses 24．Luckily 25．During/In 26．themselves 27．is thinking 28．making 29．watching 30．a
【导语】本文是一篇说明文。文章主要讲述了美国的一家公司制造机器海豚代替真海豚进行表演，以此来保护动物。
21．句意：它们给人们带来了很多快乐，但是海豚住在水族馆里并不快乐。根据“They bring a lot of joy to people.”以及“dolphins are not happy living in aquariums”可知，前后句意相反，空
格处需要表转折的连词but，but位于句首，首字母大写。故填But。
22．句意：一项研究表明，水族馆里的海豚比海里的海豚寿命短得多。根据单词提示可知此处指“那些生长在海洋的海豚”，用those指代那些海豚。故填those。
23．句意：他们在很小的时候就死于疾病。根据空格可知，此处缺少名词，结合提示可知用ill的名词illness。故填illness/llnesses。
24．句意：幸运的是，美国的一家公司会在那里帮助这些海豚。根据空格可知，此处此处用副词作状语，故填lucky的副词形式，单词位于句首，首字母大写。故填Luckily。
25．句意：在一次测试中，人们认为它们是真正的海豚。根据“people thought they were real dolphins.”可知，在这次测试中，此处表达“在一次测验中”用介词during或者in，介词位于句首，首字母大写。故填During/in。
26．句意：“机器人海豚自己可以游泳和潜水，”该公司的一名员工说。根据提示单词以及题干可知，空格处应用反身代词themselves作宾语，指代主语The robot dolphins。故填themselves。
27．句意：现在，中国的一个水族馆正在考虑用它们来代替真正的海豚。根据句意可知表示正在发生的事情，是现在进行时，其构成为am/ is/ are doing，主语是“an aquarium”，故用is doing。故填is thinking。
28．句意：为了拯救海洋动物，该公司表示，它在未来将继续生产其他不同种类的机器人动物，如鲨鱼和海马。keep on doing sth译为“继续做某事”，因此空格处应填入动词make的动名词形式。故填making。
29．句意：我们期待着观看机器人动物的节目。look forward to doing sth译为“期望做某事”，因此空格处应填入动词watch的动名词形式。故填watching。
30．句意：多亏了这个公司，越来越多的海洋动物将回到大自然，过上幸福的生活。根据题干，live a …life固定短语，译为“过……生活”。故填a。
31．carefully 32．the most important 33．to grow 34．in 35．and 36．gets 37．the 38．animals 39．them 40．forget
【导语】本文主要介绍了种植花园的一些建议。
31．句意：但是如果你想拥有一个美丽的花园，你需要仔细考虑很多事情。careful是形容词，此处使用其副词形式carefully“仔细地”，修饰think about。故填carefully。
32．句意：这是所有事情中最重要的。important是形容词，根据“of all”可知，此处使用形
容词最高级most important“最重要的”，最高级前加定冠词the。故填the most important。
33．句意：大多数植物需要充足的阳光才能生长良好。grow是动词，根据“need a lot of sunlight”可知，此处是need...to do sth.“需要……做某事”，所以空处使用动词不定式。故填to grow。
34．句意：给你花园里的植物浇水容易吗？根据“the plants...your garden”可知，此处使用in“在……里面”，表示“在花园里的植物”。故填in。
35．句意：植物需要水才能茁壮成长，并且保持健康。根据“grow strong...stay healthy”可知，空处前后是并列关系，且该句为肯定句，所以使用and“和，并且”。故填and。
36．句意：通常，雨水浇灌植物，但有时花园会因为雨水不足而变干。get是动词，根据“the rain waters plants, but sometimes the garden...”可知，句中时态为一般现在时，主语“the garden”是第三人称单数，所以动词使用第三人称单数形式。故填gets。
37．句意：你需要把水放在附近来解决这个问题。problem“问题”，名词，根据“but sometimes the garden gets dry because there is not enough rain”可知，此处特指“花园会因为雨水不足而变干”这个问题，用定冠词the。故填the。
38．句意：想想动物，比如兔子和松鼠。animal是可数名词，根据“like rabbits and squirrels”可知，此处使用名词复数表示泛指。故填animals。
39．句意：它可以帮助它们远离你的花园。they是人称代词主格，动词keep后接人称代词宾格them“它们”。故填them。
40．句意：最后，不要忘记种植花园只是为了享受乐趣。forget是动词，根据“don’t”可知，空处使用动词原形，构成祈使句否定形式。故填forget。
41．uncle’s 42．on 43．excited 44．an 45．has visited 46．Before 47．were taking
48．photos 49．talking 50．unusual
【导语】本文主要介绍了作者去大象保护区的一次经历。
41．句意：整整一年，我一直在等待暑假的开始，因为我要去印度看望我叔叔的家人。根据“For the whole year, I waited for the summer holidays to start all the time, because I would visit my…family in India.”可知，此处用名词所有格，表示“叔叔的家人”。故填uncle’s。
42．句意：最后，我在6月9日到达了那里。在具体的几月几号用介词on。故填on。
43．句意：我们如此兴奋。主语是“we”，此处用形容词“excited”作表语。故填excited。
44．句意：坐公共汽车只花了半个小时。half an hour意为“半小时”，固定用法。故填an。
45．句意：我叔叔已经参观过了，他说这曾经是一座很棒的宫殿。时间状语是“already”，因此用现在完成时，谓语动词构成为“have/has done”，主语是“My uncle”，因此助动词用“has”。故填has visited
46．句意：在我进去之前，我担心大象会跺脚踩在我身上，但很快我就放松了。根据“…I got in, I feared that the elephants might stamp on me, but soon I got relaxed.”可知，此处指“在我进去之前感到害怕”，before意为“在……之前”。故填Before。
47．句意：一些大象在洗澡，而另一些在树下休息。根据“were resting”可知，此处用过去进行时，其谓语动词构成为“were/was+doing”，主语是“elephants”，因此用were。故填were taking。
48．句意：我和我的堂兄弟喂大象，拍了很多照片。由“lots of”可知，此处用名词复数形式，photos意为“照片”。故填photos。
49．句意：在回家的路上，我们一直愉快地谈论着这次参观。keep doing sth.意为“一直做某事”，因此此处用talking，意为“谈论”。故填talking。
50．句意：这确实是我人生中一次不寻常的旅程。根据上文可知，此处指“不同寻常的旅行”，unusual意为“不同寻常的”，形容词作定语。故填unusual。
51．the 52．the largest 53．for 54．have lived 55．peaceful 56．hundreds 57．really 58．what 59．camping 60．to take
【导语】本文主要介绍了美国黄石国家公园的一些信息。
51．句意：黄石国家公园是美国的国家公园，建于1872年。此处表示特指，应填the，故填the。
52．句意：它占地约9065平方公里，是美国最大的公园之一。one of the+形容词最高级+复数名词，表示“最……之一”，故填the largest。
53．句意：黄石公园被广泛认为是世界上第一个国家公园，它以其野生动物而闻名。根据“it is famous…its wildlife”可知，因野生动物而闻名，be famous for“因……而出名”，故填for。
54．句意：美洲原住民已经在黄石公园生活了至少11000年。for+一段时间，要与现在完成时连用，主语是复数形式，助动词用have，故填have lived。
55．句意：后来，美国军队开始保护公园，并努力使其和平。make sth+形容词，表示“使某物……”，peace对应的形容词是peaceful“平静的”，故填peaceful。
56．句意：1917年，国家公园管理局在那里建造了数百栋建筑。表示概数用数词的复数形式+of，故填hundreds。
57．句意：这些建筑对于研究美国历史非常重要。此空修饰形容词important，应填副词really，故填really。
58．句意：有些人第一次来黄石公园时不知道该做些什么。此空作动词do的宾语，用what+动词不定式作宾语，故填what。
59．句意：实际上，公园里有很多有趣的活动，比如徒步旅行、露营和观光。此空与hiking构成并列关系，所以此空应填camping，故填camping。
60．句意：所以对我们来说，去黄石国家公园旅行是一个很好的选择。分析句子结构可知，此空作主语，应填动词不定式，故填to take。
61．the longest 62．themselves 63．started 64．to keep 65．but 66．shows 67．an 68．have visited 69．Although 70．can
【导语】本文主要介绍了长城的修建历史、过程和现状。
61．句意：它位于中国北部，占地13000多英里，是世界上最长的城墙。根据“It lies in northern China and covers a distance (距离) of over 13,000 miles, making it...wall in the whole world.”以及尝试可知，长城是世界上最长的城墙，long“长的”的最高级为longest，其前要加定冠词the。故填the longest。
62．句意：人们筑墙是为了保护自己不受敌人的攻击。protect oneselves“保护自己”，they“他们”的反身代词形式为themselves。故填themselves。
63．句意：长城的修建始于2000多年前的秦朝。根据“over 2,000 years ago”可知，本句为一般过去时态，动词用过去式，start“开始”的过去式为started。故填started。
64．句意：当时的皇帝想保护中国免受敌人的攻击。want to do“想做某事”，固定搭配，故填to keep。
65．句意：长城不仅是一堵保护墙，也是一座文化瑰宝。not...but...“不是……而是……”，固定句式，故填but。
66．句意：它显示了中国人民的辛勤工作，他们建造了它。根据“It...the hard work of the Chinese
people who built it over time.”可知，此句为陈述事实，所以为一般现在时，又因为主语it为第三人称单数，谓语动词show“展示”用三单，故填shows。
67．句意：长城是古代中国人如何巧妙地建造一堵很长的墙的一个惊人的例子，它也提醒人们，中国人齐心协力，从未放弃。根据“The Great Wall is...amazing example of how cleverly ancient Chinese people...”可知，此处表示长城是古代中国人如何巧妙地建造一堵很长的墙的一个惊人的例子，为泛指，又因为amazing为元音音素开头的单词，所以需用冠词an，故填an。
68．句意：来自世界各地的数百万人参观了长城。根据“Millions of people from all over the world...the Great Wall.”可知，本句表示已经有数百万人参观了长城，为现在完成时态，构成为：have/has+done，因为主语为复数形式，故填have visited。
69．句意：尽管长城很古老，但它仍然是中国文化的一个精彩部分，当今人们可以欣赏它。分析“...the Great Wall is very old, it is still a wonderful part of China’s culture that people...enjoy today. We are proud of the Great Wall.”可知，本句为让步状语从句，although“虽然”引导让步状语从句，故填Although。
70．句意：尽管长城很古老，但它仍然是中国文化的一个精彩部分，当今人们可以欣赏它。根据“it is still a wonderful part of China’s culture that people...enjoy today.”可知，此空缺情态动词，表示人们可以欣赏它，can“可以”符合题意，故填can。
71．from 72．to protect 73．an 74．fell 75．has been 76．best 77．carefully 78．and 79．her 80．wonderful
【导语】本文主要讲述了Beth Moon通过拍摄树木的图片呼吁人们珍惜古老的树木。
71．句意：Beth Moon是一位来自美国的摄影师。根据“the US”可知，Beth Moon来自美国，故填from。
72．句意：通过这样做，她希望人们能够保护和珍惜这些古老的树木。根据“want sb to do sth”可知，需要用动词不定式，故填to protect。
73．句意：她在乡下看到了一棵老紫杉。根据“old yew”可知，需要不定冠词表示泛指，old是元音音素开头的单词，an符合句意，故填an。
74．句意：从那以后，她爱上了树。根据“She saw”可知，句子时态是一般过去时，fell符合句意，故填fell。
75．句意：到目前为止，她已经去了十个国家拍摄这些古树的照片。根据“Till now”可知，句子时态是现在完成时，主语是she，助动词用has，故填has been。
76．句意：为了拍出最好的照片，她总是需要提前计划。根据“the”可知，此处需要用最高级，故填best。
77．句意：我必须仔细考虑拍摄每棵树的最佳季节。根据“think about”可知，副词修饰动词，故填carefully。
78．句意：人口少，污染少。根据“There are few people”可知，前后两句是并列关系，and符合句意，故填and。
79．句意：后来，Moon关于她的照片的书问世了。根据“photos”可知，需要形容词性物主代词修饰名词，her符合句意，故填her。
80．句意：每一本书都很特别，带读者进入树木的奇妙世界。根据“world of trees”可知，需要形容词修饰名词，wonderful符合句意，故填wonderful。
81．living 82．and 83．the cleverest/the most clever 84．to talk 85．themselves 86．about 87．doing 88．a 89．Sadly 90．thousands
【导语】本文主要介绍了世界上最大的动物——蓝鲸，也是世界上最聪明的动物之一。不幸的是，蓝鲸长时间遭到人类的捕杀，种类及数量在减少。现在已经颁布法令，禁止人类捕杀鲸鱼。
81．句意：世界上最大的动物仍然活着，并且住在海里。表示“活着的”，作表语，用living。故填living。
82．句意：蓝鲸身长可达33米，体重可达181吨。前后句为并列关系，用并列连词and。故填and。
83．句意：鲸鱼不仅是世界上最大的动物，而且是最聪明的动物之一。最高级结构“最……之一”是one of the+最高级+名词复数，clever最高级有两种，cleverest和most clever，最高级前要加the。故填the cleverest/the most clever。
84．句意：也许有一天我们会学会和鲸鱼交谈，然后它们会告诉我们关于它们自己的事情。“学会做某事”learn to do，不定式作宾语。故填to talk。
85．句意：也许有一天我们会学会和鲸鱼交谈，然后它们会告诉我们关于它们自己的事情。主宾一致，强调某人自己，用反身代词，they反身代词为themselves。故填themselves。
86．句意：有很多关于鲸鱼的故事，其中最著名的可能是美国作家赫尔曼.梅尔维尔写的《白鲸》。“关于”用about。故填about。
87．句意：他花费大量的时间研究鲸鱼。“花费时间做某事”spend time doing。故填doing。
88．句意：这个故事中，水手亚哈船长试图杀死一直叫Moby Dick的大白鲸。空处表泛指，且空后very是辅音音素开头，用不定冠词a。故填a。
89．句意：令人遗憾的是鲸鱼的种类不多了。副词放句首，修饰整个句子，sad副词为sadly。故填Sadly。
90．句意：几千年来，人们为了食物和其他东西杀害它们。“数以千计的”thousands of。故填thousands。