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
Which of the following is not mentioned as a necessary part to maintain America's scientific leadership
A．Money.
B．Combination of various disciplines.
C．Joint efforts of the most intelligent scientists.
D．Favorable academic atmosphere.
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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