What does the underlined word "exponentially" mean in the first sentence of the last paragraph ？
A. Promisingly.
B. Continuously.
C. Drastically.
D. Rapidly.
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What is the basic difference between human beings and animals in doing things in conclusion？
A. Language.
B. Memory.
C. Purpose.
D. Thinking.
What can we learn from the second paragraph？
A. Socrates can be regarded as the first social scientist in the western world.
B. The universities in Italy have no buildings.
C. Socrates created the "Socratic method".
D. Greece is not as civilized as Italy.
成本实质上是一种费用，即按一定对象所归集的费用，是对象化了的费用()
A. 正确
B. 错误
Judging from the context, "to keep your head above water" (Para. 1) probably means ______.
A. to be drown
B. to keep out of financial difficulty
C. to keep away from danger
D. to protect you h-ore water
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