gwd1-25&27&28

llxx1985cn

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Drakedirect

27. B whether 4 weeks is short term or long term is not the issue. The answer come from:
(Line21) However, when diatoms are observed under constant conditions in a laboratory, they still display periodic behavior, continuing to burrow on schedule for several weeks.
(Line 41) Biologists have concluded that even though a diatom does not rely on the environment to keep time, environmental factors can alter the period of its biological clock according to changes in the tidal cycle.
When you consider both of them, B is correct.
C is not correct, because over the long term, there is difference.

Drakedirect

From my point of view, the answer should come from
(Line41) Biologists have concluded that even though a diatom does not rely on the environment to keep time, environmental factors can alter the period of its biological clock according to changes in the gidal cycle.
So, I chose A: the accuracy of the commuter diatom's biological clock varies according to changes in the tidal cycle.
Concerning C, there is no exactly the comparision of accuracy between diatom between other species that is subject to less intense environmental pressures.

Still wait for remarks. Thanks

vivian_huang

25题还是不太明白。

 

1. 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（剧烈的） environmental pressures.

这个比较在文中那里有指出/暗示？

 

A commuter diatom has an unusu-

       ally accurate biological clock, a

consequence of the unrelenting（不屈不挠）

 (35)   environmental pressures to which it is subjected;

这一段大家说是答案的地方，我实在想不明白  

songyeonpp

无情的环境压力致使diatom有一个不同寻常的准确的生物钟。.由此推出了没有这种重大压力的种类就不会有如此准确的生物钟。

Rohto

以下是引用Drakedirect在2007-7-30 11:34:00的发言：
From my point of view, the answer should come from
(Line41) Biologists have concluded that even though a diatom does not rely on the environment to keep time, environmental factors
        can alter the period of its biological clock
        according to changes in the gidal cycle.
So, I chose A: the accuracy of the commuter diatom's biological clock varies according to changes in the tidal cycle.
Concerning C, there is no exactly the comparision of accuracy between diatom between other species that is subject to less intense environmental pressures.

Still wait for remarks. Thanks

A means, the accuracy of the commuter diatom's biological clock varies (by itself) according to changes in the tidal cycle.

,While the context says environmental factors can alter it.

Rohto

以下是引用songyeonpp在2007-8-7 9:36:00的发言：

无情的环境压力致使diatom有一个不同寻常的准确的生物钟。.由此推出了没有这种重大压力的种类就不会有如此准确的生物钟。

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.

这个a species指的是diatom?

aircavalry

以下是引用Drakedirect在2007-7-30 11:21:00的发言：
27. B whether 4 weeks is short term or long term is not the issue. The answer come from:
(Line21) However, when diatoms are observed under constant conditions in a laboratory, they still display periodic behavior, continuing to burrow on schedule for several weeks.
(Line 41) Biologists have concluded that even though a diatom does not rely on the environment to keep time, environmental factors can alter the period of its biological clock according to changes in the tidal cycle.
When you consider both of them, B is correct.
C is not correct, because over the long term, there is difference.

赞成，several weeks确实存在很大的干扰，单独定位line21的话似乎缺乏说服力，只能再联系line 41的内容加以判断。

eileenmu木

谢２５，２６楼解释，受益匪浅！！！！

x_vampire

我也选了A，但在看以上讨论的时候，特别是26楼。我突然发现一个问题。

A:The accuracy of the commuter diatom’s biological clock varies according to changes in the tidal cycle.

我觉得A的句子主干是红色部分，但准确性改变（主动）与文章意思不一至。文章是说

                                                               can alter the period of its biological clock according to changes in the tidal cycle

生物钟周期的改变，不是准确性的改变。

个人理解，欢迎讨论。

                                                               can alter the period of its biological clock according to changes in the tidal cycle

生物钟周期的改变，不是准确性的改变。

个人理解，欢迎讨论。

[此贴子已经被作者于2008-6-2 23:30:38编辑过]