单项选择题

A college student may experience stress in the following situations EXCEPT ______.

A．when he is making an important decision
B．when his self-esteem is being threatened
C．when he is working hard for a homework assignment
D．when he is doing physical exercise

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单项选择题

It can be inferred from the passage that the longer an eel is the ______.

A．more beneficial it will be to science
B．more powerful will be its electrical charge
C．easier it will be to find
D．tougher it will be to eat

单项选择题

What is the main idea of the passage

A．Electric eels are potentially dangerous.
B．Biology and electricity appear to be closely related.
C．People would be at a loss without electricity.
D．Scientists still have much to discover about electricity.