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

What effect does excessive positive ionization have on some people

A．They think they are insane.
B．They feel rather bad-tempered.
C．They become violently sick.
D．They are too tired to do anything.

单项选择题

Some scientists believe that_________.

A．watching animals to anticipate earthquakes is more effective than depending on seismographs
B．the unusual behavior of animals can not be trusted
C．neither watching nor using seismographs is reliable
D．earthquakes can not affect any animals