单项选择题
Who gave the News on the Hour
A．The President and First Lady.
B．Ed Wilson.
C．Scientists in California.
D．Jan Singer.
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单项选择题
The students who ______ tolerated the pain for the longest time.
A．listened to different radio programs
B．could produce a kind of chemicals
C．don't have stress or pain
D．listened to a funny program
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单项选择题
The main idea of the passage is ______.
A．laughter and physical exercise have similar effects on the human body
B．smile can produce the same effects as laughter
C．pain can be reduced by laughter
D．laughter is the best medicine
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