单项选择题

Which of the following is NOT true about Jill

A．She had devoted herself to skiing during high school and proved herself a very promising skier.
B．She had been a member of the U.S. Olympic ski team.
C．She was seriously wounded in the pre-Olympic tryouts.
D．Her career as a skier was destroyed in 1955.

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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.