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
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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
单项选择题
According to the passage, which of the following statement is true
A．A change in the educational system will eliminate the need to cheat.
B．The problem of student cheating has its roofs in deeper problems.
C．Students do not cheat on essay tests.
D．Punishment is an effective method of stopping cheating.
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