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．sorting food in a refrigerator

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热门试题

单项选择题

The phrase the individuals in Line 10, Para. 3 refers to ______.

A．students who practice cheating
B．parents who put pressure on their children
C．school administrators who approve of short-answer rests
D．teachers who are too hesitant to take actions against cheating

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