All of the following are mentioned in Paragraph 5 and Paragraph 6 as ways in which snakes
A. avoiding animals that may pose a threat to them.
B. finding a snake of the opposite sex in order to reproduce.
C. following other snakes during cooperative hunts.
D. determining the location of potential food sources.
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设随机变量X与Y服从正态分布，X～N(μ，42)，Y～N(μ，52)，记p1＝P｛x≤μ－4)，p2＝｛y≥μ＋5｝，则()．
A. 对任何实数μ，都有p1＝P2
B. 对任何实数μ，都有p1＜p2
C. 只对μ的个别值，才有p1＝p2
D. 对任何实数μ，都有p1＞p2
The word arduously in the passage is closest in meaning to
A. with skill.
B. regardless.
C. without rest.
D. temporarily.
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.
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