单项选择题

The analogy drawn between the earth and a spaceship is to illustrate the idea of ______ on earth.

A．unlimited resources
B．limited resources
C．recycling
D．regeneration
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单项选择题
Which of the following best conveys the' idea that man has been careless and unconcerned in his relationship with nature
A．He has exploited the earth' s resources.
B．He has shown little understanding of nature' s ways.
C．He has abused the earth' s resources.
D．He has not appreciated nature' s beauty and benefits sufficiently.
单项选择题
Today there has been a change of attitude towards nature. This is shown in ______.
A．the pollution of rivers
B．the overfishing of seas
C．the increase in air pollution e
D．the fostering of forests
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