Unit 4 The wonders of nature单元限时检测（含答案）

U4 The wonders of nature单元限时检测
限时：40分钟
一、单项选择
1. The ______ of the ice cave is over 30 meters, so we need headlamps to explore.
A. depth B. height C. weight D. shape
2. The little girl is very ______ about the blue ice, so she asks the guide many questions.
A. curious B. careful C. serious D. worried
3. The temperature in the ice cave is usually ______ zero all year round, so we need warm coats.
A. under B. on C. above D. below
4. The team ______ finished the ice cave exploration after 3 hours of hard work.
A. noisily B. successfully C. angrily D. slowly
5. If you walk too close to the edge, you may ______ falling into the cold water.
A. enjoy B. risk C. hate D. finish
二、完形填空
Last winter, I joined a small team to explore the famous blue ice caves in Iceland. It was my first time to see such amazing natural wonders, and I was very excited.
We 1. ______ early in the morning, wearing thick warm clothes and safety gear. The ice cave looked like a magical blue palace when we walked in. The ice was so clear that we could see different layers of ice inside, which 2. ______ thousands of years to form.
The path in the cave was 3. ______ and slippery, so we had to walk slowly and carefully. Our guide told us not to touch the ice walls, as some parts were very 4. ______ and could break easily. We saw many beautiful ice formations, like ice pillars and ice waterfalls, and I took a lot of photos to 5. ______ this wonderful moment.
Halfway through the trip, we reached a large ice hall. The blue light from the ice made the whole hall look like a dream. We stopped to rest, and the guide told us stories about the 6. ______ of the ice cave. It took more than 10,000 years for the ice to grow into this amazing cave.
Suddenly, we heard a loud noise from the top of the cave. The guide told us it was normal, as ice sometimes 7. ______ slowly. We didn’t feel scared, but we still followed the guide’s steps closely.
After 2 hours of walking, we 8. ______ the exit of the cave. The sunlight outside was bright, and we felt so proud of ourselves for finishing the exploration. This trip taught me that nature is full of 9. ______, and we should always respect and 10. ______ these natural wonders.
1. A. set off B. put off C. take off D. turn off
2. A. spent B. took C. cost D. paid
3. A. wide B. smooth C. narrow D. bright
4. A. strong B. fragile C. heavy D. hard
5. A. remember B. forget C. miss D. save
6. A. history B. future C. shape D. size
7. A. moves B. moved C. is moving D. was moving
8. A. arrived B. reached C. got D. came
9. A. surprises B. problems C. difficulties D. chances
10. A. pollute B. protect C. damage D. ignore
三、根据首字母或音标写出单词，使句子意思完整正确
1. The d______ of the ice cave is over 30 meters, so we need headlamps.
2. The t______ in the ice cave is always below zero all year round.
3. The little boy is very c______ about the blue ice, so he asks many questions.
4. The team s______ finished the ice cave exploration after 3 hours.
5. The ice wall is very f______, so we can’t touch it.
6. The guide told us the ______ / h stri/ of the ice cave, which is over 10,000 years old.
7. We need to take ______ / me z/ to protect the ice cave from being damaged.
8. The ______ / d st ns/ from the entrance to the ice hall is 200 meters.
9. He was ______ /d t m nd/ to explore the deepest part of the ice cave.
10. The beauty of the ice cave is a great ______ / w nd / of nature.
四、用所给单词的适当形式填空
1. Her ______ (curious) about the ice cave made her ask the guide many questions.
2. The ______ (deep) of the ice cave is over 30 meters.
3. The team ______ (success) finished the exploration after 3 hours.
4. The ice wall is very ______ (fragile), so we must be careful.
5. It took thousands of years for the ice ______ (form) into the cave.
6. We should take measures ______ (protect) the natural wonders.
7. The guide told us stories about the ______ (history) of the ice cave.
8. I ______ (take) a lot of photos during the ice cave exploration last winter.
五、阅读理解
The Amazing Blue Ice Caves of Iceland
Blue ice caves are one of the most magical natural wonders in Iceland. They are formed inside glaciers (冰川) over thousands of years, and their bright blue color comes from the dense ice that traps almost no air bubbles.
Most blue ice caves are located in the Vatnaj kull Glacier, the largest glacier in Europe. The caves are only accessible in winter, from November to March, because the ice is too soft and dangerous to visit in summer. Visitors must go with professional guides, as the ice can change quickly and sometimes collapse.
The blue ice caves are not just beautiful—they also tell us about the history of the Earth. Each layer of ice in the cave holds information about the climate from thousands of years ago. Scientists study the ice to learn about past weather patterns and how the climate is changing today.
However, the blue ice caves are in danger. Because of global warming, the glaciers are melting faster than ever before. Many ice caves that were open to visitors 10 years ago have now disappeared. Scientists are working hard to study and protect these amazing wonders before they are gone forever.
If you ever get the chance to visit a blue ice cave, don’t miss it. It’s a once-in-a-lifetime experience that will make you fall in love with the beauty of nature.
1. What makes the ice caves blue
A. The cold temperature.
B. The dense ice with almost no air bubbles.
C. The blue sky above the glacier.
D. The special minerals in the ice.
2. When can visitors visit the blue ice caves
A. From January to March.
B. From April to June.
C. From July to September.
D. All year round.
3. What does the underlined word "accessible" in Paragraph 2 mean in Chinese
A. 可进入的 B. 可融化的 C. 可研究的 D. 可破坏的
4. Why are the blue ice caves in danger
A. Because too many visitors damage them.
B. Because global warming makes the glaciers melt.
C. Because the guides stop taking visitors there.
D. Because the ice caves are too small.
5. What is the main idea of the passage
A. The history of Iceland’s glaciers.
B. How to visit the blue ice caves safely.
C. The amazing blue ice caves of Iceland and their protection.
D. The dangers of visiting blue ice caves.
六、短文填空（每空一词，有多余项）
it above safe come change take nature
temperature build light turn grow
The Waitomo Glowworm Caves in New Zealand are one of the most amazing 1. ______ wonders in the world. The caves are famous for the thousands of glowworms that live on the cave walls, making the cave look like a starry night sky.
The glowworms are tiny insects that are only found in New Zealand. They 2. ______ on the cave walls and produce a bright blue 3. ______ to attract small insects for food. The light from the glowworms 4. ______ the whole cave into a magical place that looks like a dream.
The 5. ______ in the cave is always around 15℃, which is perfect for the glowworms to live. Visitors can 6. ______ a boat ride through the underground river in the cave, and enjoy the amazing view of the glowworms 7. ______ their heads.
The caves were formed over 30 million years ago, when the area was under the sea. The limestone (石灰岩) was slowly eroded (侵蚀) by water, 8. ______ the caves and underground rivers we see today.
It is important to protect the caves, as the glowworms are very sensitive to 9. ______ in the environment. Loud noises, bright lights and pollution can hurt the glowworms and make them leave the cave.
Visitors must follow the guide’s rules to keep the cave 10. ______ for the glowworms. They can’t take photos with flash, make loud noises, or touch the cave walls.
参考答案
一、单项选择
1. A 2. A 3. D 4. B 5. B
二、完形填空
1. A 2. B 3. C 4. B 5. A
6. A 7. A 8. B 9. A 10. B
三、根据首字母或音标写出单词
1. depth 2. temperature 3. curious 4. successfully 5. fragile
6. history 7. measures 8. distance 9. determined 10. wonder
四、用所给单词的适当形式填空
1. curiosity 2. depth 3. successfully 4. fragile 5. to form
6. to protect 7. history 8. took
五、阅读理解
1. B 2. A 3. A 4. B 5. C
六、短文填空
1. natural 2. grow 3. light 4. turns 5. temperature
6. take 7. above 8. building 9. changes 10. safe