单项选择题


A．composes
B．contains
C．consists
D．condenses
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单项选择题
A．tasteB．colorC．flavorD．fragrance
A．taste
B．color
C．flavor
D．fragrance
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.
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