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

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热门试题

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 rotating water sprinkler

单项选择题

What effect does excessive positive ions 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.