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问题
单项选择题
金刚石的组成元素与下列()物质相同。
A.二氧化硅
B.石墨
C.金刚
D.二氧化硫
答案
参考答案:B
改错题
下列各句中均有一处错误,请指出并改正。
1. Three-year-olds is too young to dress themselves.
2. The boy is not enough old to be a volunteer.
3. You can’t allowed to go boating today.
4. The teachers come from England. So are the students.
5. I’m not allowed to go out on school nights too.
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判断题
照明是指以太阳光线为光源。
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