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。