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

Why was Helen Keller blind, deaf and unable to speak（）

A．Because she’d been born that way.
B．Because a horse had kicked her.
C．Because she’d had a very high fever.
D．Because she’d had a bad fall.

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