单项选择题

We can conclude that ______.

A．civilization may be doomed if pollution is not controlled
B．pollution is more serious in Europe than it is in America
C．most people do not know that pollution is a serious problem
D．black snow is not so serious compared with white snow

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单项选择题

In author’s opinion, ______.

A．without computers, there would be no modern science
B．computers are more intelligent than human beings
C．computers will replace everything in the future
D．computers never make mistakes

单项选择题

According to the author, America is a highly modern society, ______.

A．so people like it better than before
B．but there is still a big gap between different classes
C．all the people there lead a very happy, life
D．all the industries and companies are in the hands of the goverment