第三部分：英语知识运用
第一节完形填空
阅读下面短文，从短文后各题所给的`A、B、C和D.四个选项中选出能填人空白处的最佳选项，并在答题卡上将该项涂黑。
In September, in Britain, you may see a lot of birds 36 on roofs and telegraphwires．These birds are swallows．They are37together because, very soon, they will beflying 38 to much warmer lands, where they will find 39 small flying insects onwhich they 40There are no such insects 41 in Britain during the winter, as it is42．cold for them.
The swallows settle, fly off, swoop, and43 again．This they do many times, for theyare making short44 flights in order to be fit for the long journey45them.
46 of these migrating birds leave Britain in the autumn．They fly47for hundreds ofmiles48 they reach the warm lands of Africa．But not all the birds get there, for many ofthem perish in the stormy weather they meet with49.
In the spring of the following year they 50 the long and tiring journey back to Britain.
They return to the identical barn or tree in the51 district which they had left the52autumn.
How do these birds find their53 there and back over such vast distances? Nobody knows ex-actly54 , but it has something to do55 winds and air currents.
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