单项选择题

Pearl fishing,or the search for pearl-bearing oysters,takes place in shallow waters.

A．is taught
B．occurs
C．is prohibited
D．starts
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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
单项选择题
Penicillin was discovered by chance in 1928.
A．finally
B．accidentally
C．experimentally
D．opportunely
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