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单项选择题

Questions 16 to 18 are based on the passage you have just heard.

A．It encourages the growth of some bacteria.
B．It does not remove all chemicals.
C．It is not done on a regular basis.
D．It has been improved by new technologies.
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热门试题

单项选择题A．He likes the gray tie.B．He likes the silk tie.C．He likes neither.D．He likes both ties.

A．He likes the gray tie.
B．He likes the silk tie.
C．He likes neither.
D．He likes both ties.

单项选择题A．It requires several preparatory courses.B．It is a very popular optional course.C．It has nothing to do with math and physics.D．Most students fail to pass it.

A．It requires several preparatory courses.
B．It is a very popular optional course.
C．It has nothing to do with math and physics.
D．Most students fail to pass it.