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

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

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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.
【C1】
选项 A、being perched
B、perching
C、being perching
D、be perched
答案B
解析 本题考查动词see的用法。句意为：你可以看见很多鸟儿在屋顶或电线上栖息。see sb．doing sth．看见某人正在干某事。
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