新课程能力培养八年级英语人教版
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第二节 阅读短文，从方框中所给的选项中选出可以填入空白处的最佳选项，其中有一个多余的选项。
Why don't birds get lost on their long flights from one place to another? 17. ______ Now they're beginning to get the answer.
Not long ago, experiments (实验) showed that birds rely on (依靠) the Sun to guide them during daylight hours. 18. ______ Tests have showed that some night-flying birds are able to follow the stars in their long flights.
A dove (鸽子) had spent its lifetime in a cage and had never flown under a natural sky. 19. ______ The bird's cage was placed under a man-made star-filled sky. The bird tried to fly in the same direction (方位) as that taken by his outdoor cousins. Any change in the position of the man-made stars made a change in the direction of his flight.
The stars are clearly very important to doves. But when the stars are hidden by clouds, they rely on mountains, coastlines (海岸线), and rivers. 20. ______
A. Yet it showed an inborn (天生的) ability to use the stars to lead the way.
B. But what about birds that fly by night?
C. Scientists have asked this question for many years.
D. People often used doves to send messages.
E. But when it's too dark to see these, the doves fly helplessly, unable to find their way.
答案：17.C 18.B 19.A 20.E
解析：17题前句提问“鸟为何不迷路”，C项“科学家多年来问这个问题”承接自然；18题前讲白天靠太阳，后讲夜间靠星星，B项“但夜间飞行的鸟呢”过渡；19题前描述笼中鸽子，A项“但它天生会用星星导航”转折并引出实验；20题前讲靠山脉等，E项“若看不见这些，鸽子会无助飞行”进一步说明，D项“鸽子送信”无关，故多余。
二、完形填空（共10小题，每小题1分；满分10分）
阅读短文，理解其大意，从A、B、C、D四个选项中选出可以填入空白处的最佳选项。
The name of the redwood tree comes from its color. Redwood trees are very tall. They're even taller than some 21. ______, for example, a 2-storey (层) house. 22. ______ do they grow so tall? Well, they grow as long as they live. And they 23. ______ a very long time. Redwood trees can live for 2000 years!
Redwood trees usually grow by the sea. The 24. ______ there is just right for them. It's not too cold or too 25. ______. There's a lot of rain. Redwood trees grow well in rain.
If you see a redwood tree, you'll 26. ______ that its bark (树皮) is really thick. It's 15 to 30 cm thick. Bugs (虫子) 27. ______ redwood bark, because it had a bad taste. The thick bark helps 28. ______ the trees from fires, too. Redwood trees are very big, but their seeds (种子) are 29. ______ small. A redwood seed is as small as a tomato seed. In fact, 30. ______ redwood trees don't come from seeds sometimes. New redwood trees can grow from the stump (树桩) of an old redwood tree.
答案：21.D 22.B 23.A 24.C 25.B 26.D 27.A 28.B 29.C 30.D
解析：21. 树比建筑物（如两层房子）高，选D（buildings）；22. 问“如何长这么高”，选B（How）；23. 寿命长用live，选A（live）；24. 海边的天气（weather）适宜，选C（weather）；25. 不冷也不热（hot），选B（hot）；26. 会发现（find out）树皮厚，选D（find out）；27. 虫子不喜欢（dislike）树皮，因味道差，选A（dislike）；28. 保护（stop...from）树免受火灾，选B（stop）；29. 种子相当（pretty）小，选C（pretty）；30. 新（new）树有时不从种子来，选D（new）。
