ETS官方样题 求解释？

nohairdosUID: 3159059

各位帮助我解一道题，这是06年ETS给出的官方样题，这篇阅读有两道题我不是很明白啊，
26题明明说了The pull mechanism has long been favored by
most scientists. 为啥A可以选啊？
还有27题 文中哪儿提到pull theroy跟太阳的关系了？？
不甚感激啊


A tall tree can transport a hundred gallons of water  
a day from its roots deep underground to the treetop. Is this
movement propelled by pulling the water from above or pushing
it from below? The pull mechanism has long been favored by
most scientists. First proposed in the late 1800’s, the theory
relies on a property of water not commonly associated with
fluids:  its tensile strength. Instead of making a clean break,
water evaporating from treetops tugs on the remaining water
molecules, with that tug extending from molecule to molecule
all the way down to the roots. The tree itself does not actually
push or pull; all the energy for lifting water comes from the
sun’s evaporative power.


26. Consider each of the three choices separately and select all
that apply.

  Which of the following statements is supported by the
passage?

A. The pull theory is not universally accepted by
scientists.  
B. The pull theory depends on one of water’s physical
properties.  
C. The pull theory originated earlier than did the push
theory.  

27. Select and indicate the best answer from among the five
answer choices:

  The passage provides information on each of the following
EXCEPT

A. when the pull theory originated  
B. the amount of water a tall tree can transport  
C. the significance of water’s tensile strength in the pull
theory  
D. the role of the sun in the pull theory  
E. the mechanism underlying water’s tensile strength
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sherryweyUID: 2596010

最后一句，昂~

jeffrey-jinUID: 2711580

楼主21题，谁能再求解释下？我选了C，文章没说啊