单项选择题

The mixture of elements in the air can be thought ________ a solution of gases.

A．of as
B．of
C．as
D．of to

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单项选择题

Nancy hasn't begun working on her Ph.D ________ working on her master's.

A．still because she is yet
B．yet as a result she is still
C．yet because she is still
D．still while she is already

单项选择题

I'm getting fat. ________ .

A．If I were you, I'll eat less
B．If I am you, I'd eat less
C．If I were you, I'd eat less
D．If you were me, I'd eat less

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