题目

. John's success has nothing to do with good luck. It is years of hard work __________has made him what he is today.      A. why            B. when           C. which           D. that 答案：D 解析: 考查强调句型。题干为强调句型，被强调部分为years of hard work，故选D项。黄金首饰的纯度用“K”来表示，若24K是纯金，某顾客从商店买了一个质量为10.0g 的18K金项链，这条项链的含金的质量约为（　　）A．1.8gB．2.5gC．10.0gD．7.5g