单项选择题

What can be used as a material to pave roads（）

A．The coal by-product.
B．Additive.
C．Fine-as-powder fly ash.
D．Both B and

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单项选择题
The influenza discovered by a doctor in Singapore is caused by （）

A．a new type of virus
B．type A virus
C．a sub-group of type B virus
D．a virus only existing in Asia
填空题
A. trail B. certain C. again D. faint
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