单项选择题

Many people fail in learning a language because ______.

A．they are too old
B．they lack language ability
C．they lose their own confidence
D．the teachers are not good enough
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单项选择题
According to the passage, in the competition for scientific leadership,______.
A．applied research is of the greatest significance
B．basic research is of the greatest significance
C．research in high-energy physics is of the greatest significance
D．research in high-tech fields is of the greatest significance
单项选择题
The example given in the third paragraph is mainly used to show ______.
A．western Europe is spending more money than America in certain fields
B．Europeans are making more discoveries than Americans in retain fields
C．European scientists are more intelligent than American scientists
D．America's scientific leadership is being replaced by European countries
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