GWD1-Q28,我还是搞不懂啊?

Amyfly

 Recently biologists have been

          interested in a tide-associated

         periodic behavior displayed by

Line      the diatom Hantzschia virgata, a

  (5)     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

 (10)     burrowed in the sand during high

tide, and emerge on the sand sur-

face during the daytime low tide.

Just before the sand is inundated by

the rising tide, the diatoms burrow

 (15)     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

 (20)     in pressure caused by tidal move-

         ment.  However, ....

GWD1-Q28:

The primary purpose of the passage is to

             

1. dispute the influence of environmental factors on the tide-associated behavioral rhythms displayed by the diatom Hantzschia virgata

2. describe how certain tide-associated behavioral rhythms displayed by the diatom Hantzschia virgata have changed over time

3. compare tide-associated behavioral rhythms to solar-day behavioral rhythms in the diatom Hantzschia virgata

4. examine how certain biological and environmental influences affect the tide-associated behavioral rhythms displayed by the diatom Hantzschia virgata

5. identify certain environmental factors that limit the effectiveness of the biological clock in the diatom Hantzschia virgata

看过讨论, 觉得D虽然讲了文章的意思,但是问题问的是the primary purpose,不是main idea?我摘录下来的内容都是作者阐述的其他科学家的观点,从however后面开始批判.所以,我觉得主要的意图就应该选A啊?

Amyfly

有讨论的吗

小小鱼儿04

这题我也是没有搞明白A为什么不行，有的说文中不仅有反对也有赞成，可是dispute不是也有议论讨论的意思么？D选项的examine好像有点奇怪啊

aeoluseros

dispute是争论性的讨论不一样的

starbabe

为什么不选E啊？NN告诉我下吧  觉得这4个选项都差不多啊

AlienX

文章並沒有說那些environmental factors會limit the effectiveness of the biological clock..

simonhu

本文对“环境有影响”是没有争议的，而主要是在说明如何影响的，所以感觉D比A更合适。而且第一段下半部讲解certainbiological，第二段讲解environmentalinfluences，故D也比A全面。

苏晨

A.  dispute the influence of environmental factors on the tide-associated behavioral rhythms displayed by the diatom Hantzschia virgata 错误，文中第二段是在提生物的因素――生物钟，只提环境因素概括不全面

jingyi8560

就是在B和D里面犹豫，不知道B错在哪里了？

Paulinepeng30

仔细看了,同问,B D好象都正确.B错在哪里?求大虾帮助