第二节 完型填空
阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中选出能填入相应空白处的最佳选项。
In September, in Britain, you may see a lot of birds 【B1】 on roofs and telegraph wires. These birds are swallows. They are 【B2】 together because, very soon, they will be flying 【B3】 to much warmer lands, where they will find 【B4】 the small flying insects on which they 【B5】 There are no such insects 【B6】 in Britain during the winter, it is 【B7】 cold for them.
The swallows settle, fly off, swoop, and 【B8】 again. This they do many times, for they are making short 【B9】 flights in order to be fit for the long journey 【B10】 them.
【B11】 of these migrating birds leave Britain in the autumn. They fly 【B12】 for hundreds of miles 【B13】 they reach the warm lands of Africa. But not all the birds get there, for many of them perish in the stormy weather they meet with 【B14】 .
In the spring of the following year they 【B15】 the long and tiring journey back to Britain. They return to the identical barn or tree in the 【B16】 district which they had left the 【B17】 autumn. How do these birds find their 【B18】 there and back over such vast distances? Nobody knows exactly 【B19】 , but it has something to do 【B20】 winds and air currents.
【B1】
A.being perched
B.perching
C.being perching
D.be perched
发布时间:2020-09-18正确答案:C
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