单项选择题

The underlined phrase "such a reaction" (Para. 3) most probably refers to ______.

A．making a choice between "flight and fight"
B．reaction to cases both chemically and physically
C．responding to crises quickly
D．losing heart at the .signs of difficulties
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单项选择题
Which of the following statements is TRUE
A．We can find some ways to avoid stress.
B．Stress is always harmful to people.
C．It is easy to change the habit of keeping oneself busy with work.
D．Different people can withstand different amount of stress.
单项选择题
People are finding less and less time for relaxing themselves because ______.
A．they do not know how to enjoy themselves
B．they do not believe that relaxation is important for health
C．they are traveling fast all the time
D．they are becoming busier with their work
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