单项选择题

What is a by-product of burned coal（）

A．Aluminum, silicon, and magnetic.
B．Paving material.
C．Fly ash.
D．Concrete additiv

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填空题
A．polite B．pocket C．orange D．sorry
单项选择题
Student A: Thanks a lot for what you have done for me. You’ve been very thoughtful. Student B:（）

A. I think so.
B. Don’t mention it.
C. Please take it easy.
D. What’s the matter
E. And you
F. I’d love to.
G. But he panned to.
H. Me, too.
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