问答题

A change of state from a solid to a liquid form requires heat energy.

【参考答案】

从固态变为液态需要热能。

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问答题

We know that the mastery of a foreign language is not easy.

单项选择题

From the passage we can see that this building（）

A．was big enough to hold all the citizens of the city
B．was difficult because of the lack of detail
C．was the most modem Opera House till then
D．was built with the joint efforts of the country