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主要就是讲生物钟和潮汐时间的文章. Q23: Which of the following can be inferred from the passage about the effect of the solar-day cycle on the tide-associated periodic behavior displayed by commuter diatoms? A. The solar-day cycle makes this behavior less advantageous to the commuter diatoms at certain times of the year. B. The solar-day cycle makes this behavior somewhat more erratic. C. The solar-day cycle makes this behavior less important to the survival of the commuter diatoms. D. Because of the solar-day cycle, this behavior is forced to proceed at a more rapid pace at certain times during the 24-hour day. E. Because of the solar-day cycle, this behavior is not expressed at certain times during the 24-hour day.
The passage suggests which of the following about the accuracy of the commuter diatom’s biological clock?
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.
我选的是23:B 24:A 请NN们指导指导.谢谢 | 
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发表于 2009-7-29 11:13:00
