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

By observing the behavior of animals, scientists may be able to _______.

A．prevent disasters
B．organize groups of people
C．predict earthquakes
D．control areas of California

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