单项选择题

A．they had no idea about scientific forestryB．they had ……

According to the author, the greatest mistake of our forefathers was that______.

A．they had no idea about scientific forestry
B．they had little or no sense of environmental protection
C．they were not aware of the significance of nature study
D．they had no idea of how to make good use of raw materials

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热门试题

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

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

单项选择题The author describes the telephone as impartial because______.

A．saves lives of people in remote places
B．enables people to live alone if they want to
C．spreads both love and ill will
D．replaces much written communication

单项选择题The telephone has intensified conflicts among people because______.

A．it increases the danger of war'
B．it provides services to both the good and the malicious
C．it makes distant communication easier'
D．it breaks up the multi-generational household