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
The girl sneezed continuously because she ______.
A．was ill
B．was mentally ill
C．was afraid of falling ill
D．had attracted world-wide attention
单项选择题
When a person sneezes, we say God bless you because ______.
A．it' s a tradition
B．the person is possessed of an evil spirit
C．the person is ill
D．God will bless those who sneeze
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