单项选择题

According to the author, the major problem with Germany's tax system is __________.

A．business investment is taxed too heavily
B．the tax rates are high but the tax base is narrow
C．revenues in the form of taxes are not reinvested
D．it encourages individuals or companies to escape taxation
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单项选择题
The author believes that __________.
A．questions concerning consciousness are outside the scope of scientific research
B．sooner or later man can think up all the questions concerning nature and answer them
C．man can find solutions sooner or later to whatever questions concerning nature he can think up
D．man cannot solve all the problems he can think up because of the limits of human intellect
单项选择题
Which of the following mentioned about scientists in earlier times is true
A．They correctly claimed to know all about nature.
B．They did not believe in results from scientific observation.
C．They paid much attention to the problems they didn't understand.
D．They invented false theories to explain things they didn't understand.
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