C.Liu Xiang is a strong­minded man.

　　D.Liu Xiang surprised his fans with strong comeback.

　　解析：考查文章的主旨大意。由文中第一，二段以及最后两段可知，本文主要围绕刘翔在全运会摘金而进行报道，故A项正确。

　　答案：A

　　C

　　Not all math skills are learned in the classroom.Some of them come naturally.Consider the split­second calculations you make when you estimate the number of empty seats on the school bus or the number of cookies in a cookie jar.

　　These estimates can often be done without counting.That's because humans are born with the ability to closely guess the number of items in a group.Researchers call this ability a person's “number sense”.

　　To see how a person's inborn number sense might be linked to mathematical performance in the classroom， psychologist Justin Halberda and his colleagues from Johns Hopkins University in Baltimore， US ran some tests.

　　The scientists asked 64 14­year­olds to look at images(影像) of yellow and blue dots that flashed on a computer screen for a fraction(一小部分)of a second. Each image contained between 10 and 32 dots that varied in size.

　　Some images contained twice as many blue dots as yellow dots.In other images，however，the number of blue and yellow dots was nearly equal.For each image，the students were asked to estimate which color had more dots.

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