多项选择题

He did not work hard enough at his lessons.________(否则他就会通过考试了)
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单项选择题
Exercise is a detestable way for anxiety.
A．Y
B．N
C．NG
单项选择题
The reason why the electric eel is able to give more powerful shock is that______.
A．the working system of the electric plates in the eel is the most effective
B．the working system of the electric plates in the eel is far inferior to those in the torpedo
C．compared with those in the torpedo, the working system of electric plates in the eel is more direct and efficient
D．compared with other electric fish, the eel possesses much more electric plates
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