单项选择题

A．They were going to the mall.
B．They were riding an elevator.
C．They were thinking about the stairs.
D．They were carrying a heavy box upstairs.
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单项选择题
The research findings report commercial rather than political trends.
A．Y
B．N
C．NG
问答题
For this part, you are allowed thirty minutes to write a welcome speech on behalf of the department to welcome Professor Thomas to give a lecture. You should write at least 120 words according to the guidelines given below in Chinese.假设你所在的化学系邀请著名化学教授(Thomas)做讲座，请你写一篇欢迎词。内容主要包括：1．表示热情欢迎2．简要介绍教授的情况
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