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

What effect does excessive positive ionization have on some people

A．They think they are mad.
B．They feel very tired.
C．They become violently sick.
D．They are too tired to do anything.

单项选择题

A high negative ion count is likely to be found _______.

A．near a pond with a water pump
B．close to a slow-flowing river
C．high in some barren mountains
D．by a rotation water sprinkler