单元自测试卷八年级英语下学期人教版
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（
B
）8. The second paragraph mainly talks about _______.
A. how fast swifts can fly
B. why swifts can fly and turn so fast
C. why swifts make sharp turns
D. how swifts turn around in the sky
答案：B
解析：第二段先讲雨燕能飞多快，接着说明原因“because their wings are like boomerangs... This shape helps them to fly much faster.”以及“They can also move one wing faster than the other, which allows them to make sharp turns...”，整体是在讲雨燕能快速飞行和转弯的原因，选B。
（
A
）9. Which of the following is TRUE about swifts?
A. Swifts can't walk for a long time because of their short feet.
B. Swifts can fly for a long time because of their small bodies.
C. Swifts don't live on land because of their wings.
D. Swifts can catch nearly 1,000 bugs in one go with the saliva.
答案：A
解析：文中提到“Swifts' short feet are not good for walking or standing on land for long.”，A项正确；B项文中未提及体型小是能长时间飞行的原因；C项雨燕主要在空中生活，但不是因为翅膀而不生活在陆地上；D项“One food ball can contain nearly 1,000 bugs.”是一个食物球包含近1000只虫子，不是一次用唾液捕捉，选A。
（
D
）10. Which of the following best shows the structure of the passage?
答案：D
二、完形填空（共10小题，计10分）
阅读下面的短文，理解其大意，然后从各小题所给的A、B、C、D四个选项中选出一个最佳答案，使短文连贯、完整。
In autumn, it gets cold. Some birds like wild geese fly __1__ for the winter, flying in a "V" formation. __2__ do they fly in a "V" formation? Scientists find out that in this way, they can save energy. So they can fly __3__. And the trip will be safer and easier because they are travelling with the help of one another.
答案：见下页
