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
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
单项选择题
At this time next week, we_______the matter with our friends
A．are going to discuss
B．will be discussing
C．are discussing
D．are to discuss
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