新Prep1 82

lmiltamy

82.    (28316-!-item-!-188;#058&002977)



When feeding, aquatic birds known as phalaropes often spin rapidly on the water’s surface, pecking for food during each revolution.  To execute these spins, phalaropes kick one leg harder than the other.  This action creates upwelling currents.  Because plankton on which phalaropes feed typically occurs in greater quantities well below the surface, it is hypothesized that by spinning phalaropes gain access to food that would otherwise be beyond their reach.





Which of the following, if true, most strongly supports the hypothesis?

A. Phalaropes rarely feed while on land.

B. A given phalarope spins exclusively either to the right or to the left.

C. Phalaropes sometimes spin when they are not feeding.

D. Different phalaropes spin at somewhat different rates.

E. Phalaropes do not usually spin when food is abundant at the surface.

答案是E        but i am so confused between C and E

please help ~~

lmiltamy

可以回答一下嗎??

sweeet

这个hypothesis是，通过转圈，这个P东西可以达到本来达不到的食物。E顺理成章，如果表面吃的多，他们就不打转了，C说的是他们没有吃东西的时候也可能打转，那怎么知道他们吃东西打转是不是为了吃本来吃不到的东西呢？这个对这个假设没有任何support，反而有weaken。

ptlove4ever

题目翻译：p这种水鸟在捕食时会在水面上快速旋转，每一次旋转时迅速抓取猎物。为了实现旋转，一条腿比另一条腿踢得更有力，通过旋转产生向上的气流。由于它们捕食的浮游生物很多都在水面以下很深的地方，猜想：p鸟通过旋转可以够到原本够不到的猎物。
题型：支持题，支持的对象：hypothesis：p鸟通过旋转可以够到原本够不到的猎物
典型的现象解释文，加强：通常是否定句，假设另外一种情况。
P鸟通过旋转够到原本够不到的猎物，那么对于容易够到的猎物，它们就不用旋转了——E