单项选择题

A．care
B．much
C．advantage
D．profit
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单项选择题
According to the author, we should reverse our classification of the physical sciences as hard and the social sciences as soft because ______.
A．a reverse ordering will help promote the development of the physical sciences
B．our knowledge of physical systems is more reliable than that of social systems
C．our understanding of the social systems is approximately correct
D．we are better able to investigate social phenomena than physical phenomena
单项选择题
The chances of the physical sciences being subject to great changes are the biggest because ______.
A．contradictory theories keep emerging all the time
B．new information is constantly coming in
C．the direction of their development is difficult to predict
D．our knowledge of the physical world is inaccurate
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