单项选择题

According to scientists, people sneeze because_______.

A．they are ill
B．to sneeze is human nature
C．they do not need any conscious help
D．there are unwanted things in their noses
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单项选择题
When a person is off work and hanging out at home, he doesn't like it, why
A．He has nothing to do during the holidays and so he feels useless.
B．His routine timetable is changed so he doesn't feel comfortable.
C．He doesn't have any responsibilities and pressures, so he feels uneasy.
D．If he feels happy during the holidays, work will be more unbearable when the holi- days are over.
单项选择题
Which of the following concerning the internal clock structure is NOT true
A．Our daily routine and realities are very important to maintain the internal clock structure.
B．People should keep themselves busy in order to maintain the internal clock structure.
C．Once the internal clock structure is disrupted, we feel very uncomfortable.
D．Once the internal clock structure is disrupted,it takes some time for the structure to function properly again.
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