Gmat test code 31 Q1

[evelynfantast]

The chanterelle, a type of wild mushroom, grows beneth host trees, such as the douglas fir, which provide it with necessary sugars. The underground filaments of chanterelles, which extract sugars, in turn provide nutrients and water for the hosts because of this mutual beneficial relationship, harvesting the chanterelles growing beneath a douglas fir sereiously endangers the tree. Which of the following, is true, casts the most doubt on the conclusion drawn above?
a. the number of wild mushrooms harvest as increased in recent years.
b. chantelles grow not only beneath douglas fir, but also beneath other host trees
c. many types f wild mushrooms are found only in forests & cannot easily be grown elsewhere
d. The harvesting of wildmushrooms stimulates future growth of those mushrooms.
e. young douglas fir seedings die without the nutrients & watere provided by chanterlle filaments.

請教各位 ,正確答案是 D

[evelight]

這位同學...發問前請先參考板規
http://www.formosamba.com/phpBB3/viewtopic.php?t=7137
並寫明你想要請教什麼問題

你的問題愈清楚，大家愈能對症下藥幫你

[evelynfantast]

sorry.
我是選最後一個
可是我有眼部太清楚文章裡說的"既是"Mutually beneficial又是endanger the tree的矛盾"如果就反對endanger the tree來說,選項E裡頭without chanterelle會讓douglas fir seeds die就可以充分拒絕文中說法,D選真的讓我有點莫名奇妙
請教各位,thanx

[evelynfantast]

sorry.
我是選最後一個
可是我有眼部太清楚文章裡說的"既是"Mutually beneficial又是endanger the tree的矛盾"如果就反對endanger the tree來說,選項E裡頭without chanterelle會讓douglas fir seeds die就可以充分拒絕文中說法,D選真的讓我有點莫名奇妙
請教各位,thanx

[CUGGYER]

他的意思是 前提 T/M共生 結論 若收成M會使T受害
weak這個結論

E 選項說沒有M T的seed就會死掉 變成在support這個結論

而D 是說收成M可以加速M的成長 所以收成M不會使T受害

有錯請指正