单项选择题

According to experts, half of all mental health problems first appear（）

A. at the age of fifteen.
B. before the age of fifteen.
C. at the age of fifty.
D. before the age of fifty.

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单项选择题

A. Horror movies.
B. Action movies.
C. Cartoon movies.
D. Classic movies.

单项选择题

A. He doesn’t start work very early.
B. He feels tired all the time.
C. He has no appetite.
D. He sleeps badly.

According to experts, half of all mental health problems first appear（） 您的浏览器不支持 audio 元素。