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．preliminary
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单项选择题
As I recall my plane trip around the world last July and August, I think my difficulty was the adjustment to the different ______ served with the food in the various cities we visited.
A．seasonings
B．qualities
C．grades
D．ingedients
单项选择题
You are afraid to attack him directly. You, therefore, are resorting to ______.
A．criticism
B．condemantion
C．innuendo
D．effrontery
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