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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【
admin
2017-05-27
35
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.
【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:他们会回到他们前一年秋天离开的那个地区的同一间谷仓或同一棵树。
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