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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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
The second sentence of the first paragraph, We have lived through..., off a hound , intends to say that ______.
A．many rivers and creeks have been excessively polluted by various contaminants
B．our lives depend on flaming rivers and caustic creeks
C．we cannot prevent rivers and creeks from being hounded
D．people cannot live without the supply of water from rivers and creeks
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