In a second test, mice were clocked on how long they actively tried to escape a pool of water. Those exposed to night lights stopped struggling and just floated in the water, a sign of “behavioural despair”，10 times as long as the mice that had experienced normal nighttime darkness. All symptoms of depression disappeared within two weeks of the mice returning to a normal lightdark cycle, the researchers report. The scientists also could quash the behavioural symptoms by injecting (注射)the brains of animals with a drug that prohibits the activity of certain molecules linked with human depression. This finding further suggests that light at night may cause something related to depression.

　　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?

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