单项选择题

（）, water, is composed of two parts hydrogen and one part oxygen

A．As is known
B．As be known
C．As known
D．Which is known

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单项选择题

Bill is an example of a severely disabled person who has become（）at many survival skills.

A. proficient
B. persistent
C. consistent
D. sufficient

单项选择题

The character armor consists of defensive character traits, like arrogance or apprehensiveness, that developed in childhood to（）painful feelings.

A. turn aside
B. ward off
C. bread up
D. watch over

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