The word arduously in the passage is closest in meaning to
A. with skill.
B. regardless.
C. without rest.
D. temporarily.
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已知函数f(x)在区间(1－δ，1＋δ)内具有二阶导数，f〞(x)＜0，且f(1)＝fˊ(1)＝1，则()．
A. 在(1－δ，1)和(1，1＋δ)内均有f(x)＜x
B. 在(1－δ，1)和(1，1＋δ)内均有f(x)＞x
C. 在(1－δ，1)内f(x)＜x，在(1，1＋δ)内f(x)＞x
D. 在(1－δ，1)内f(x)＞x，在(1，1＋δ)内f(x)＜x
The word accumulated in the passage is closest in meaning to
A. inspected.
B. discovered.
C. collected.
D. maintained.
The word modification in the passage is closest in meaning to
A. adjustment.
B. invention.
C. growth.
D. condition.
What can be inferred from Paragraph 5 about plow animals？
A. Their use was mandated under the system of Manorialism.
B. They can pull more weight with their chests than with their necks.
C. They were replaced by new technologies in the eleventh century.
D. Humans began to utilize them around 900 ＣＥ.
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