单项选择题

Some abnormal human behavior may be caused by eating substances that upset delicate chemical balances in the brain.

A．nourish
B．favor
C．prevent
D．disturb
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单项选择题
Penicillin was discovered by chance in 1928.
A．finally
B．accidentally
C．experimentally
D．opportunely
单项选择题
Good health is a family's most valued possession.
A．noticeable
B．useful
C．costly
D．precious
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