单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．A publisher.
B．A writer.
C．An automobile engineer
D．An advertiser.
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单项选择题
According to this passage, two research teams ______.
A．have determined the full range of contaminants in the water supply
B．have ascertained the geographic extent of the water pollution
C．have developed new methods to measure water contaminants
D．have succeeded in preventing drinking water from being polluted
单项选择题
Which of the following can serve as the best title of the passage 9
A．The Organic Compounds in the Water.
B．Drinking Water Drugged.
C．Polluted Rivers and Streams.
D．Guidelines for Safe Water.
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