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标题: 求助，一道GWD阅读题 [打印本页]

作者: Celia0709 时间: 2016-7-2 14:57
标题: 求助，一道GWD阅读题
Recently biologists have been interested in a tide-associated periodic behavior displayed by the diatom Hantzschia virgata, a microscopic golden-brown alga that inhabits that portion of a shoreline washed by tides (the intertidal zone).Diatoms of this species, sometimes called "commuter" diatoms, remain burrowed in the sand during high tide, and emerge on the sand surface during the daytime low tide. Just before the sand is inundated by the rising tide, the diatoms burrow again. Some scientists hypothesize that commuter diatoms know that it is low tide because they sense an environmental change, such as an alteration in temperature or a change in pressure caused by tidal movement. However, when diatoms are observed under constant conditions in a laboratory, they still display periodic behavior, continuing to burrow on schedule for several weeks This indicates that commuter diatoms, rather than relying on environmental cues to keep time, possess an internal pacemaker or biological clock that enables them to anticipate periodic changes in the environment. 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.

This is not to suggest that the period of this biological clock is immutably fixed. Biologists have concluded that even though a diatom does not rely on the environment to keep time, environmental factors-including changes in the tide's hydrostatic pressure, salinity, mechanical agitation, and temperature-can alter the period of its biological clock according to changes in the tidal cycle. In short, the relation between an organism's biological clock and its environment is similar to that between a wristwatch and its owner: the owner cannot make the watch run faster or slower, but can reset the hands. However, this relation is complicated in intertidaldwellers such as commuter diatoms by the fact that these organisms are exposed to the solar-day cycle as well as to the tidal cycle, and sometimes display both solar-day and tidal periods in a single behavior. Commuter diatoms, for example, emerge only during those low tides that occur during the 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.
C is the key. 定位回原文，很容易推出C。但感觉A也没错。求助哪位牛人帮忙解释一下A错在哪了？谢谢~~！

作者: ai559031 时间: 2016-7-4 11:32
根據第二段：
environmental factors-including changes in the tide's hydrostatic pressure, salinity, mechanical agitation, and temperature-can alter the period of its biological clock according to changes in the tidal cycle

並不是只有tidal cycle會影響還有很多原因，所以Ａ是錯的

作者: 油闹家 时间: 2016-7-4 12:51
A. The accuracy of the commuter diatom’s biological clock varies according to changes in the tidal cycle.
A句的意思是生物钟的精度会随着潮汐循环的改变而改变。
但是第二段的前几句的意思是“生物钟”随潮汐循环的改变而改变，没有提到“精度”。这属于偷换概念了。

作者: Celia0709 时间: 2016-7-4 15:04

ai559031 发表于 2016-7-4 11:32
根據第二段：
environmental factors-including changes in the tide's hydrostatic pressure, salinity, ...

我就是根据这句话选的A，感觉A的avries according to并没有一定要表示唯一才正确呀，只要提到了其中任何一项都可以是对的啊

作者: Celia0709 时间: 2016-7-4 15:06

油闹家发表于 2016-7-4 12:51
A. The accuracy of the commuter diatom’s biological clock varies according to changes in the tidal ...

是否可以理解为the accuracy和the period of its biologcal clock的区别？

作者: 油闹家 时间: 2016-7-4 15:22
没错，原文如下：
“environmental factors-including changes in the tide's hydrostatic pressure, salinity, mechanical agitation, and temperature-can alter the period of its biological clock according to changes in the tidal cycle. ”
因此，“A. The accuracy of the commuter diatom’s biological clock varies according to changes in the tidal cycle”是错误的，把“The accuracy of the commuter diatom’s biological clock ”改成“]the period of its biological clock ”就正确了。
因为varies according to changes in the tidle cycle (随着潮汐循环而改变的)不是“ accuracy ”，而是“ the period of its biological clock ”
不知道这样的解释你听明白了没有？

作者: Celia0709 时间: 2016-7-5 09:43

油闹家发表于 2016-7-4 15:22
没错，原文如下：
“environmental factors-including changes in the tide's hydrostatic pressure, sali ...

明白~我做题时自动默认the accuracy和the period of its biological clock是一个东西了。谢谢！

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