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.

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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

单项选择题

Why did it take so long to develop the X-ray microscope

A．Funds for research were insufficient.
B．The source of illumination was not bright enough until recently.
C．Materials used to manufacture X-ray tubes were difficult to obtain.
D．X-ray microscopes were too complicated to operate.