题目

  ____makes some people appear astonishingly youthful while others seem much older than their actual age?       A.What it is              B.What is it that       C.What it is that D.Why it is what 答案：B 解析:  考查强调结构的特殊疑问句。句意为：究竟为什么有些人会看起来年轻得让人吃惊，而另一些人却看起来比实际年龄苍老得多？题干缺少主语，因此如果句首只填一个词时应填what,变为强调结构的特殊疑问句则是What is it that...。

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