2. 外语
  3. We learn from the first paragraph that laughter Doctors have found that laughter

We learn from the first paragraph that laughter Doctors have found that laughter

admin2009-06-15  82
问题 We learn from the first paragraph that laughter
Doctors have found that laughter
选项 A、keeps down blood pressure.
B、has similar effects to physical exercise.
C、decreases the heart rate.
D、increases stress.
答案B
解析
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