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.
【C3】
选项 A、to south
B、the south
C、to southwards
D、south
答案D
解析 本题考查上下文句意的理解。根据40题对本句句意解析，这里south是副词，意为“向南方…”。 ’
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