2. 外语
  3. In September, in Britain, you may see a lot of birds【C1】______on roofs and telegraph wires. These birds are swallows. They are【C

In September, in Britain, you may see a lot of birds【C1】______on roofs and telegraph wires. These birds are swallows. They are【C

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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.
【C13】
选项 A、until
B、before
C、when
D、as
答案B
解析 本题考查上下文句意的理解。根据第47题对本句句意解释可知，B为正确选项。before意为“在…之前”。
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