单项选择题

A．Fish have difficulty absorbing oxygen in warmer seawater.
B．The seawater temperature is increasing.
C．Fish have trouble finding enough food in warmer seawater.
D．More fish have to find another location.
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单项选择题
A．It is easy to invest in the stock market.B．Stock investment is really complex.C．Fixed interest fields are more profitable.D．A broker is necessary in the stock investment.
A．It is easy to invest in the stock market.
B．Stock investment is really complex.
C．Fixed interest fields are more profitable.
D．A broker is necessary in the stock investment.
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