单项选择题

Penicillin was discovered by chance in 1928.

A．finally
B．accidentally
C．experimentally
D．opportunely
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Good health is a family's most valued possession.
A．noticeable
B．useful
C．costly
D．precious
单项选择题
The concert was called off due to the storm.
A．recommended
B．demanded
C．amended
D．cancelled
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