单项选择题

After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.

A．abortive
B．difficult
C．experimental
D．excellent
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单项选择题
The patient was making good progress but suffered a ______ when he caught a cold.
A．setoff
B．set-in
C．setdown
D．setback
单项选择题
The remedies proposed for dealing with the situation ore only ______ promises for action for the future.
A．courageous
B．colossal
C．vague
D．elaborate
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