commit suicide(自杀)．

If you are sixty­five or older, you are also at a higher risk of experiencing a mood decrease.Many times, the loss of control over our lives or increased illness and weakness that accompany the aging process, lead to severe loneliness.As well, studies show that children as young as five are now experiencing emptiness.It is easier for teens to break down after long­term depression.Truly, this is something that affects every age group.

29．What do we know about depression from the first paragraph?

A．It happens without any clear reason.

B．Major changes in life can always cause depression.

C．It can happen because of different reasons and causes.

D．Sensitive people will probably develop depression.

答案　C

解析　细节理解题。第一段主要是讨论抑郁产生的原因，故第三项正确。其他三项太过绝对化。

30．What does the underlined word probably mean in Paragraph 3?

A．After giving birth.

B．Before being pregnant.

C．The fact of becoming a parent.

D．The thought of committing suicide.

答案　A

解析　词义猜测题。由此段第二句中的following their babies' birth可知，该词的意思应该是妇女生产后，即after giving birth。

31．What does the writer want to tell us in the last paragraph?

A．Old people are more likely to suffer from loneliness.

B．Depression can happen to people of any age group.

C．Emptiness is the major cause of young people's depression.

D．Weakness and ever­lasting illness go hand in hand with depression.

答案　B

解析　细节理解题。在最后一段里，作者主要是告诉我们不同年龄的人都可能遭遇不好的情绪，即抑郁。

Few of us make money by losing sleep.But three graduate students at Brown University in Providence built a company around sleep deprivation(睡眠不足)．