单项选择题


A．change
B．changing
C．to change
D．being changed
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单项选择题
In the passage the term human problems or world problems refers mainly to ______.
A．global food shortage
B．resources depletion
C．environmental pollution
D．all of the above
单项选择题
Which of the following would the author probably agree with
A．The environment crisis will not be solved unless we stop using virgin materials.
B．In scientific research, a higher priority should be given to understanding all living systems.
C．Exploration of outer space will finally lead to an improvement on human living conditions.
D．U.S. high-technology companies are applauding this new twist in scientific research.
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