单项选择题

How many_______known altogether

A．species of fishes are
B．species of fish is
C．specieses of fish are
D．species of fish are
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单项选择题
Don't touch that wire. It's_______.
A．living
B．alive
C．live
D．lively
单项选择题
His latest medical study suggests that high blood pressure_______with unhealthy life- styles.
A．has something to do
B．have something to do
C．had something to do
D．is having something to do
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