In paragraph 2, "such a reaction" refers back to______.
A. making a choice between 'flight or fight'
B. reaction to stress both chemically and physically
C. responding to crises quickly
D. losing heart at the signs of difficulties
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If you take in more vitamins than you actually need, ______.
A. they are harmful to your body
B. you get all the vitamins now known to be needed
C. they help our bodies more properly
D. your body simply gets rid of them
A．examplesB．samplesC．mattersD．chances
A. examples
B. samples
C. matters
D. chances
In the last sentence of the article, "do so" refers to .
A. expose ourselves to stress
B. find ways to deal with stress
C. remove stress from our lives
D. establish links between diseases and stress
What is this passage mainly about？
A. The benefits that laughter can bring to people.
B. A landmark experiment that is called Rx Laughter.
C. How Justin Black felt when a volunteer appeared in the hospital room.
D. Why Bill Marx became a member of the experiment team to test the effect of laughter.
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