Which statement about the experiment of lttborato
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Which statement about the experiment of lttboratory rats is correct?
A.One group was exercised by running circles inside.
B.One group was exercised in a complicated obstacle course outside.
C.The animals that learned to go through the obstacle course exhibited a greater number of brain cells than the animals in the exercised or inactive groups.
D.The animals that exercised inside the automatic wheel possessed a greater density of blood vessels in the brain than did either of the other two groups of animals.
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答案：D
文章第三段和第四段告诉我们选项A应该是。nning inside an automatic wheels；选项B文中没有提到是inside还是outside；选项C应该是a great number of brain connections；选项D是正确的。