单项选择题

People should be able to come to a decision about ions in the air if they ______.

A．note their own reactions
B．move to a healthier area
C．observe domestic animals
D．watch how wealthy people behave
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单项选择题
According to the passage, static electricity can be caused by ______.
A．using home-made electrical goods
B．wearing clothes made of natural materials
C．walking on artificial floor coverings
D．copying TV programs on a computer
单项选择题
The main idea of the passage is that ______.
A．rich people always tend to commit suicide
B．money can always bring happiness to children
C．life is always joyful for children born rich
D．it is love not money that brings happiness tn rich children
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