单项选择题

The author's attitude towards tile current situation ill the exploitation of natural resources is______.

A．positive
B．neutral
C．suspicious
D．critical
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单项选择题
It can be inferred from the third paragraph that earlier generations didn't realize
A．the interdependence of water, soil, and living things
B．the importance of the proper use of land
C．the harmfulness of soil destruction and river floods
D．the extraordinarily rapid growth of population
单项选择题
According to the passage, it is the telephone that______.
A．has made letter writing an art
B．has prevented wars by avoiding written communication
C．has made the world different from what it was
D．has caused wars by magnifying and extending human conflicts
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