问题补充：
Because of the snow,many parts of the countryside are only by helicopter.
A. available
B. appropriate
C. accessible
D. achievable
答案：
A. available
B. appropriate
(答案→)C. accessible
D. achievable
解析：available可得到的,appropriate合适的；accessible可到达的；achievable取得成就的。因为parts of the countryside 是地方,故选accessible。
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