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问题 单项选择题

人类最早使用的金属是（）

A、铁

B、铝

C、铜

D、银

答案

参考答案：C

选择题
_____ maths is concerned, Tom is the best student in our class.
A. As long as
B. As well as
C. As soon as
D. As far as
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选择题

一筒汽油用去一半后，剩下的汽油[ ]

A．比热容、密度不变，热值减半

B．比热容、密度、热值均不变

C．比热容、密度、热值均减半

D．比热容减半，密度、热值不变
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