单项选择题

The discoveries of science often are a mixed blessing. On the one hand they give us valuable pesticides that enable the farmer to grow more abundant crops and on the other hand they ______ the benefits by destroying the balance of nature.

A．compromise
B．misplace
C．damage
D．counterract
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单项选择题
The constitutional guarantee of free speech may have been aimed at protecting native speakers of English from censorship, but it is not a great ______ to interpret it as protecting the right to express oneself in any natural language or dialect.
A．mystery
B．extension
C．sacrifice
D．condemnation
单项选择题
Which of the following would be the most appropriate title for the passage
A．The History of Black People in the United States.
B．West African Tribal Relations.
C．The Origin of Modern African-American Consciousness.
D．Slavery: A Democratic Anomaly.
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