Student expeditions do a great deal of good work on the Arctic islands but from time to time cause trouble in the huts, probably

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问题     Student expeditions do a great deal of good work on the Arctic islands but from time to time cause trouble in the huts, probably because students are not familiar with the【C1】______of the little wooden huts dotted all over the islands of the Spizbergen group.
    Each hut generally has an inner and an outer door, shutters over the windows, a store of wood laid up outside, dry chopped wood inside, utensils and cutlery, and【C2】______all, a small store of food. All these things must be completely in【C3】______whenever the hut is left. It makes no【C4】______if it is only the middle of July. That particular hut may not be【C5】______again before the winter. A door left open can lead either to snow filling up the hut to the ceiling, or worse still, wind【C6】______the roof off. Unfastened shutters leave the windows an easy prey for polar bears searching for food and the result is again snow in the hut. The ready-chopped wood is also very important.
    A traveler visiting the hut in the middle of the dark time and perhaps in bad weather, his feet, hands and face【C7】______by the frost, will have his difficulties doubled if the wood he left has been used up by others and he had nothing with which to【C8】______a fire.     Ten or more years ago there were enough hunters to look after most of the huts, but now many buildings have become【C9】______because there is no one to repair them and because of【C10】______.
A)blowing B)carelessness C)bitten D)particular
E)above F)ever G)laid H)light
I)perfect J)difference K)useless L)pleasure
M)order N)visited O)conventions
【C6】

选项

答案A

解析 此短句和or前的短句是并列的关系,故这里也需要一个现在分词,只有blowing符合,意为“风将屋顶吹掉”。
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