单项选择题


A．explode
B．choke
C．expand
D．blow
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单项选择题
(Although) the danger that he might (be injured), Smith (bravely entered) the burning house (in order) to save the boy.
A．Although
B．be injured
C．bravely entered
D．in order
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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