18.C

　　“五分之二”的英语表达为two-fifths。当分子大于1时，分母要用复数形式；two-fifths of the mountains作主语。谓语动词要用复数形式。故选C。

　　19.A

　　在“数词+名词+形容词”结构中，不论数词是多少，其后面的名词都用单数形式，且中间需有连字符，故选A。

　　（2011·广东卷）It has been argued by some that gifted children should be grouped in special classes, The

　　1

　　has been on the belief that in regular classes these children are held back in their intellectual (智力的) growth by

　　2

　　situation that has designed for the

　　3

　　children.

　　There can be little doubt that

　　4

　　classes can help the gifted children to graduate earlier and take their place in life sooner. However, to take these

　　5

　　out of the regular classes may create serious problems.

　　I observed a number of

　　6

　　children who were taken out of a special class and placed in a

　　7

　　class. In the special class, they showed little ability to use their own judgment, relying

　　8

　　on their teachers’ directions. In the regular class, having no worry about keeping up, they began to reflect

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