Human studies linking nighttime light and mood disorders are important but can't easily detect molecular underpinnings (分子结构)as animal studies can，says George Brainard of Thomas Jefferson University. The new work, he says, suggests that the change of the biological clock by light at night can be “an extremely powerful force in regulating biology and behaviour”．

　　1．After being exposed to continuous nighttime light，the mice ________．

　　A．changed their preferences

　　B．escaped from the water more eagerly

　　C．remained active as before

　　D．showed less interest in their favourites

　　2．What does the underlined word “quash” in Para. 4 probably mean?

　　A．Study.B．Predict.C．Ease.D．Cause.

　　3．We can learn from the last paragraph that ________．

　　A．light at night may have practical value

　　B．the biological clock is beneficial to humans

　　C．human mood disorders cannot be healed easily

　　D．human studies are more important than animal studies

　　4．What is the main idea of the passage?

　　A．Nighttime light may foster depression.

　　B．A drug has been found to cure mood disorders.

　　C．The study on animals can be applied to humans.

　　D．Human biological clock can be controlled by light.

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