Children’s brains can’t develop properly_______ they lack proteinA．whenB．sinceC．
题型：不详难度：来源：
Children’s brains can’t develop properly_______ they lack protein| A．when | B．since | C．because | D．unless |
|
答案
| A |
解析
| 本题考查when的一个特殊用法。在本题中的when引导的是一个条件状语从句，相当于if。整个句子的意思是：如果孩子缺少蛋白质，大脑就不能正常发育。 |
举一反三
A model or an experiment in a science class can help students see things which would ______ remain hidden.| A．otherwise | B．still | C．thus | D．therefore |
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Mr. Zhang is mild in character. He never shouts__________ he is very angry.| A．ever before | B．before | C．until | D．ever when |
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Countless people in developing countries no longer suffer malnutrition.______，poverty remains a problem worldwide.| A．While | B．Nevertheless | C．Besides | D．In addition |
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| What the boy enjoys _____ to have a room of his own. |
—What should we pay more attention to if we go north in winter, Mum?
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