单项选择题

From the passage we know that Negroes ______.

A．have no self-respect.
B．have no history.
C．need to have an interest in history.
D．need to learn what they have done for America.
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单项选择题
The main task now facing ecologists, environmental activists and conservationists is ______.
A．to prevent pollution by legislation, economic incentives and persuasion
B．to arouse public awareness of the importance of environmental protection
C．to take radical measures to control environmental pollution
D．to improve the quality of life by enforcing environmental standards
单项选择题
According to the passage what is unknown to many people is that ______.
A．the drip cup benefited light industry.
B．the truth about carver was twisted or concealed.
C．sugar-refining owes a lot to a Negro.
D．a Negro invented the frying pan.
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