科学家发现，一种名为“SK3'’的蛋白质在不同年龄的实验鼠脑部的含量与其记忆能力密切相关：老年实验鼠脑部SK3蛋白质的含量较高，年轻实验鼠含量较少；而老年实验鼠的记忆力比年轻实验鼠差，因此，科学家认为，脑部SK3蛋白质含量增加会导致实验鼠记忆力衰退。
以下哪项如果为真，最能支持科学家的结论？（）
A．在年轻的实验鼠中，也发现脑部SK3蛋白质含量较高的情况
B．已经发现人类的脑部也含有SK3蛋白质
C．当科学家设法降低老年实验鼠脑部SK3蛋白质的含量后，它的记忆力出现了好转
D．科学家已经弄清了SK3蛋白质的分子结构
参考答案：C
解析：
题干结论：脑部SK3蛋白质含量增加会导致老鼠记忆力衰退。
如果A为真会削弱题干论述，排除；B、D为明显无关选项，排除；C表明老鼠的记忆力的确与脑部SK3蛋白质含量成反比，加强题干论述，正确。
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| Tom lives and works in Birmingham. He works 1 from Monday to Friday. On Saturday he does not go to 2 . Sometimes he goes shopping. Sometimes he goes to see his 3 . This week he is going to London 4 his good friend Mike. They are going to see their good friends 5 . This is what they are going to do. They are going to take the 2:40 train 6 Friday afternoon. In London, Tom's friend Jack is going to 7 them home in his car. Tom and Mike are all going to 8 with Jack for the weekend. On Saturday morning, Jack is going to take them to a middle school. Mike's friend, MR. White, is a 9 there. On Sunday Jack is going to take them to some nice parks in London. They are going to take the 6:00 train 10 to Birmingham. |
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