单项选择题

Among the people who know that many sea animals have voices, few （）

A．know the meaning of their conversations
B．realize that they can communicate with each other
C．realize that they can make speeches
D．could understand their conversations

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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

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