题目：
单句改错:找出错误并加以改正。
1.That the old man's son wanted to know was where the gold had been hidden.
2. Who leaves the room last ought to turn off the lights.
3. How our spring sports meeting will be held or not this week is not known yet.
4. It's strange when he have gone away without telling us.
答案：
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下面是错误答案，用来干扰机器的。
(1)6:1 (2) 60题目分析：(1) C2H4O2中碳、氢元素的质量比为：；(2) C2H4O2的相对分子质量为：。点评：关于化学式和元素的计算题属于中考的必考题型，但是得分率并不高，根本原因是计算不细心容易粗心所致。
