Unit 6 Using Language
一、重点短语
1. __________抬头看……
2. __________由……组成
3. __________ 省略
4. __________随心所欲;为所欲为
5. __________(数量、位置、程度等)达到
6. __________在途中;接近
7. __________前往
8. __________ 同意(计划、安排等)
9. __________ 导致;通向
10. __________遭受;忍受;患……病
二、选词填空
agree to, consist of, have one's way, head for, lead to, leave out, look up at, suffer from
1. It is clear to me now that the two words can be _________ in the sentence.
2. China _________ 56 ethnic groups. Among them, the Han ethnic group has the largest population.
3. _________ headache, she had to take a painkiller.
4. He is a person who _________, and never cares to listen to others' advice.
5. We were about _________ the next tourist attraction, when suddenly it began to rain.
6. The small path _________ a deep valley with no one knowing about it.
7. We couldn't but _________ her decision though it was unreasonable.
8. When he _________ the sky once again, he felt it a bit different.
三、阅读理解
Wildfire is one of the most powerful forces in nature. While North America's wildfire season typically peaks in late summer and early fall, climate change is already being blamed for a longer fire season.
When experts explain fire, they often talk about something called the "fire triangle": heat, fuel and oxygen. All three must interact for a fire to get started and to keep going. Take away any one of these and the fire is suppressed.
Heat is constantly coining out from a fire, warming the surrounding air and preheating fuel in its path. According to experts at the National Interagency Fire Centre heat allows fire to travel more easily by evapourating the moisture(水分) from nearby fuel. The temperature of these fuels can sometimes grow so high that they begin to burn even before they come into contact with flames.
Fuel is really just anything that can burn. That could mean both living and dead plants, coal and buildings. What's important to know here is that it's the moisture inside a fuel that determines how easily it will burn. Living trees have a lot of moisture. Dead trees have very little. But if a fire is really hot, the moisture content of a fuel means very little. In areas where the plants are dry, the temperature needed for burning is much lower.
For a fuel to burn, it needs to react with oxygen from the surrounding air so that it can release heat, which in turn helps the fire to spread. The air we breathe contains roughly 21 percent oxygen. Most fires require only 16 percent oxygen. Wildfire can change its supply if the oxygen level drops below 16 percent. Hot flames cause the air to heat up, and hot air will rise. Fresh air from a higher part of the sky then rushes in, providing the fire with new oxygen.
1.In North America, wildfire happens the most frequently in ________.
A.late spring B.early summer
C.late summer and early fall D.late winter
2.The underlined word "suppressed" in the second paragraph probably means "_______".
A.ended B.improved C.lit D.allowed
3.We can learn from the fourth paragraph that ________.
A.living plants can also catch fire easily in wildfire
B.coal is the most important fuel in wildfire
C.the moisture inside a fuel is hard to be driven out
D.in areas where the plants are dry the temperature is often low
4.What is the passage mainly about
A.The harm of wildfire. B.The science of wildfire.
C.How to prevent wildfire. D.Wildfire caused by climate change.
答案以及解析
一、
答案:1. look up at
2. consist of
3. leave out
4. have one's way
5. up to
6. on the way
7. head for
8. agree to
9. lead to
10. suffer from
二、
答案:1. left out
2. consists of
3. Suffering from
4. has his way
5. to head for
6. leads to
7.agree to
8. looked up at
三、
答案:1-4.CAAB
解析:语篇解读:野火经常会演变成旷日持久的大火灾,是什么让它难以被扑灭
1.解析:细节理解题。由第一段的North America's wildfire season typically peaks in late summer and early fall可知答案为C项。
2.解析:词义猜测题。前一句指出如果大火要开始和持续,那么有三个要素“必须”都具备,如果其中一个不存在了,那么大火就会熄灭。故A项正确。
3.解析:推理判断题。由第四段的信息"...it's the moisture inside a fuel that determines how easily it will burn. Living trees have a lot of moisture... But if a fire is really hot, the moisture content of a fuel means very little."可知A项正确。
4.解析:主旨大意题。文章主要介绍的是“火三角”中的三个要素是如何互相作用致使野火长久不灭的,研究的正是野火背后的科学知识,故选B项。
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