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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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.
单项选择题
What does the sentence The air helps purify the water illustrate
A．The ecological balance.
B．The water cycle.
C．The earth' s limited resources.
D．The life cycle.
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