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
My friend's parents ______ her to marry the poor young man, but at last she succeeded.
A．banned
B．prohibited
C．prevented
D．forbade
单项选择题
After they tested the chemical and biological ______ of the samples we had sent them, they wrote up the report.
A．assets
B．characters
C．abnormities
D．properties
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