单项选择题

(The atmosphere) (is consisted) of certain gases (mixed together) (in) definite proportions.

A．The atmosphere
B．is consisted
C．mixed together
D．in
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单项选择题
Canning (is) the (most wide) used (method) of food (preservation).
A．is
B．most wide
C．method
D．preservation
单项选择题
He is opposed (to) the project (for the reason why) it is not (feasible) (for the time being).
A．to
B．for the reason why
C．feasible
D．for the time being
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