答案　C

　　4．Which of the following statements is TRUE according to the passage?

　　A．By 2020，about 50 percent of the students in China will have mental problems.

　　B．Mental problems mainly appear among the youth while they are seldom seen among adults.

　　C．China has the largest number of youngsters with psychological problems.

　　D．Many schools have realized the problem and taken measures.

　　解析　考查细节理解。结合文章第三段可知，到2020，青少年心理问题的比率在世界范围内将达到50%，而并非在中国，判断A项错误；B、C两项文中无判断依据，故错误；根据文章最后一段由“Schools in many cities were reported rolling out measures to...”可判断D项正确。

　　答案　D

　　B

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