单项选择题

We should-----when we want to glimpse inside the sun.

A．answer questions about its temperature
B．translate the sounds into images
C．know how gases inside ebb and flow
D．measure the pitch
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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 consol environmental pollution
D．to improve the quality of life by enforcing environmental standards
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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