单项选择题


A．taste
B．color
C．flavor
D．fragrance
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单项选择题
Which of the following statements is true
A．Altogether 95 different contaminants have been found in streams.
B．Nearly 80 percent of the streams surveyed contains only the familiar contaminants.
C．The most frequently detected contaminants are usually in low concentrations.
D．The average number of contaminants in each stream surveyed is seven.
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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