The finding of these results, in the simplest terms, is that “you reduce the risk of getting depression when you exercise,” said Maria Lindskog, a researcher at the Karolinska Institute.

　　74. The researchers at the Karolinska Institute in Stockholm conducted the new study hoping to know______.

　　A. if exercise cushions against depression

　　B. what can lead to depression in animals and people

　　C. if stress can contribute to the development of depression

　　D. how exercise contributes to reducing someone’s risk for depression

　　75. We can infer from the new experiment conducted by researchers at the Karolinska Institute that mice are depressed except when ______.

　　A. they stand still in place

　　B. they stop searching for the sugar water

　　C. they attempt to escape from the cold-water zone

　　D. they can’t experience normal pleasures any longer

　　76. Researchers asked a group of adult volunteers to complete three weeks of frequent endurance training in order to ______.

　　A. know if exercise can help to safeguard the mind against depression

　　B. know if they can endure 40 to 50 minutes of moderate cycling or jogging

　　C. confirm the findings above are also relevant to people

　　D. ensure they can lose weight after moderate cycling or jogging

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