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  3. In September, in Britain, you may see a lot of birds【C1】______on roofs and t

In September, in Britain, you may see a lot of birds【C1】______on roofs and t

游客2025-07-22  1
问题     In September, in Britain, you may see a lot of birds【C1】______on roofs and telegraph wires. These birds are swallows. They are【C2】______together because, very soon, they will be flying【C3】______to much warmer lands, where they will find【C4】______small flying insects on which they【C5】______There are no such insects【C6】______in Britain during the winter, as it is【C7】______cold for them.
    The swallows settle, fly off, swoop, and【C8】______again. This they do many times, for they are making short【C9】______flights in order to be fit for the long journey【C10】______them.
   【C11】______of these migrating birds leave Britain in the autumn. They fly【C12】______for hundreds of miles【C13】______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【C14】______.
    In the spring of the following year they【C15】______the long and tiring journey back to Britain. They return to the identical barn or tree in the【C16】______district which they had left the【C17】______autumn. How do these birds find their【C18】______there and back over such vast distances? Nobody knows exactly【C19】______, but it has something to do【C20】______winds and air currents. [br] 【C17】
选项 A、before
B、previous
C、ago
D、former
答案 B
解析 本题考查形容词辨析。previous意为“(时间或顺序上)先前的”。句意为：它们会回到去年秋天它们离开的那个地区的同一间谷仓或同一棵树上。
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