Children’s brains cannot develop properly they lack protein.A. because B. sinceC. when D. unless 题目和参考答案——青夏教育精英家教网—

题目内容

Children’s brains cannot develop properly _________ they lack protein.

A. because B. since

C. when D. unless

【解析】

试题分析：考查连词辨析。在本题中的when引导的是一个条件状语从句，相当于if。Because因为，since自从，因为，unless除非。句意：如果孩子缺少蛋白质，他们的大脑就不能适当的发展。故C正确。

考点：考查连词辨析

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参考词汇：近视的 short-sighted; 坚持 stick to

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