2. 外语
  3. Millions of tons of water are ______ by a complex system of dykes.

Millions of tons of water are ______ by a complex system of dykes.

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问题 Millions of tons of water are ______ by a complex system of dykes.
选项 A、held up
B、held on
C、held out
D、held back
答案D
解析 本题是说数百万个水离子被一种复杂的沟渠系统阻挡住了。D项“hold back”阻挡；阻止……的发展；隐瞒(秘密)；踌躇，畏缩不前(如His poor education is holding him back．The police held back the crowd．He was holding something back from us．No one held back in face of danger．)，符合题意。其他三项中，hold up“举起；支撑；使停顿，使不能继续进行；(拦路)抢劫”；hold on(单独用)“握住不放，坚持下去，(电话)请等一会儿”；hold out(单独用)“伸出；坚持(要求)，不屈服(for sth)”，都不符合题意。
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