D.is decreasing
解析:选C.句意:在过去几十年里,由于全球变暖,北极的海冰一直在减少.由时间状语over the past decades可知,主句只能用现在完成时,故选C.
4.You can take as many as you like,because they are free of ________. A.fare
B.charge C.money
D.pay
解析:选B.句意:你想拿多少就拿多 少,因为它们是免费的.free of charge为固定搭配,意为“免费”,符合句意.
5.Low-income residents can’t afford to ________ a doctor or purchase medicine when they get sick. A.claim
B.consult C.occupy
D.capture
解析:选B.句意:当低收入居民生病 时,他们负担不起看医生或买药的费用. claim要求;consult请教,consult a doctor看医生,符合句意;occupy占据;capture夺取.
6.(2017·安庆模拟)It is reported that a ________ will be offered to information leading to the arrest of the bank robber. A.price
B.fund C.reward
D.profit
解析:选C.句意:据报道,提供有关帮助抓获那个银行抢劫犯信息的人将得到报酬.price价格;fund基金;profit益处,均不合句意;reward表“报酬”之意,符合句意.
7.It took him a long time to ________the skills he needed to become a professional artist. A.acquire
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