单项选择题

Jackie complained that nobody was doing anything to______.

A．prevent people from having trouble with teeth
B．stop teeth from falling out
C．put men on the moon
D．transplant hearts and other organs
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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
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
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