题目内容
7．-Too much homework has made me tired these days，Mr．Zhang．-That's true．But a small tree won't grow into a big tree it experiences lots of winds and rains．（ ）
| A． | if | B． | because | C． | when | D． | unless |
分析 --张老师，太多的作业让我最近感到很劳累．
--那是事实，但是如果一棵树苗不经历风和雨，它就不会成长为一棵参天大树．
解答 答案：D．
本题考查的是从属连词的辨析．根据题意，从主句句意"如果一棵树苗不经历风和雨"和从句句意"它就不会成长为一棵参天大树．"来看，这里需要一个表假设的连词，主句用一般将来时从句用一般现在时说明后句是表假设的条件状语从句，结合选项，unless可以引导一个表假设的条件状语从句，意为"除非"，相当于if not．故选D．
点评 比较和分析选项中连词的不同含义及其用法是解答该题的关键；还要根据句中信息正确推测该句句意，进而作出解答．
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