The word These in the passage refers to
A. particles.
B. openings.
C. tips.
D. odors.
查看答案
The word boosted in the passage is closest in meaning to
A. served.
B. affected.
C. raised.
D. designed.
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.
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.
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