单项选择题

The word "sloths" in the first paragraph probably means ______.

A．ordinary people.
B．lazy bones.
C．lazy habits.
D．retired professors.
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单项选择题
Laughing has positive effects on people's health because ______.
A．it can produce more hormones.
B．it can accelerate their pulse.
C．it can raise their blood pressure.
D．it can help them relax.
单项选择题
Which of the following is NOT implied by Dan Kieran
A．Laziness should be highly extolled.
B．Laziness is generally considered bad.
C．The importance of exercise is often overestimated.
D．People should learn to put their feet up.
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