文章讲的开头Recently biologists have been interested in atide-associated periodic behavior displayed by the diatom Hantzschia virgata, a microscopic golden-brown alga that inhabitsthat portion of a shoreline washed by tides (the intertidal zone).相信很多CDer都做过了~请大家帮忙分析下后面的几道题哈~ GWD1-Q27: Accordingto the passage, the periodic behavior displayed by commuter diatoms underconstant laboratory conditions is characterized by which of the following?
A. Greater unpredictability than thecorresponding behavior under natural conditions B. A consistent periodic schedule in the short term C. No difference over the long term from thecorresponding behavior under natural conditions D. Initial variability caused by the constantconditions of the laboratory E. Greater sensitivity to environmental factors thanis the case under natural conditions 这道题什么意思啊~B为什么是对的呢？
GWD1-Q28: Theprimary purpose of the passage is to
A. dispute the influence of environmentalfactors on the tide-associated behavioral rhythms displayed by the diatom Hantzschia virgata B. describe how certain tide-associated behavioralrhythms displayed by the diatom Hantzschiavirgata have changed over time C. compare tide-associated behavioral rhythmsto solar-day behavioral rhythms in the diatom Hantzschia virgata D. examine howcertain biological and environmental influences affectthe tide-associated behavioral rhythms displayed by the diatom Hantzschia virgata E. identify certain environmental factors thatlimit the effectiveness of the biological clock in the diatom Hantzschia virgata
Q27： 其实很明显B是正确的！ 因为：首先定位题目commuter diatoms under constant laboratory，在第一段however后面。
However, when diatoms are observed under constant conditions in a laboratory, they still display periodic behavior, continuing to burrow on schedule for several weeks
GWD1-Q25: The passage suggests which of the following about the accuracy of the commuter diatom’s biological clock? 定位：accuracy和commuter diatom’s biological clock，在第1段最后一句 A. The accuracy of the commuter diatom’s biological clock varies according to changes in the tidal cycle. B. The unusual accuracy that characterizes the commuter diatom’s biological clock is rare among intertidal species. C. The commuter diatom’s biological clock is likely to be more accurate than the biological clock of a species that is subject to less intense environmental pressures. D. The commuter diatom’s biological clock tends to be more accurate than the biological clocks of most other species because of the consistency of the tidal cycle. E. The accuracy of the commuter diatom’s biological clock tends to fluctuate when the diatom is observed under variable laboratory conditions.
第一段最后“A commuter diatom has an unusually accurate biological clock, a consequence of the unrelenting environmental pressures to which it is subjected; any diatoms that do not burrow before the tide arrives are washed away.”这句话就可以解释了，也是找定位词。
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发表于 2011-11-4 00:40:39
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