求助 大侠们看看一道阅读题 谢了

binbin250000UID: 2142376

0401 阅读第15题 我觉得选c，科答案选d,为什么?



Lichens. probably the hardiest of all plants, live where virtually nothing else can---not
  just on rugged mountain peaks but also on sunbaked desert rocks. They are usually the
  first life to appear on a mountainside that has been scraped bare by an avalanche.
Line  Unlike other members of the plant kingdom, lichens are actually a partnership between
5 two plants. The framework of a lichen is usually a network of minute hairlike fungus that
  anchors the plant, The other component is an alga (similar to the green film of plant life
  that grows on stagnant pools) that is distributed throughout the fungus. Being green plants,
  algae are capable of photosynthesis--that is, using energy from the Sun to manufacture
  their own food. The fungi arc believed to supply water, minerals, and physical support to
10 the partnership.
Lichens are famous for their ability to survive ~ water shortage. When water is scarce
  (as is often the case on a mountain), lichens may become dormant and remain in that
  condition for prolonged periods of time. Some lichens can even grow where there is no
  rain at all, surviving on only occasional dew--the moisture that condenses on the surface
15 of the plants at night, And unlike most other plants, lichens are little affected by the strong
  ultraviolet rays in the mountains.
     Lichens use little energy, for they grow slowly. Some grow so slowly and are so old
  that they are called "time stains." You may find lichens that are centuries old; certain of
  these lichen colonies have been established for an estimated 2,000 years.
20   For decades, scientists wondered how the offspring of an alga and a fungus got together
  to form a new lichen, it seemed unlikely that they would just happen lo encounter one
  another. It was finally discovered that in many cases the two partners have never been
  separated. Stalklike "buds" that form on certain lichens are broken off by the wind or by
  animals; these toll or are blown to a new location


题目：15. It can be inferred from the passage that lichens use less energy and   grow more slowly when   
(A) the environment is polluted         
(B) they are exposed to ultraviolet rays
(C) they are very old               
(D) the supply of water is inadequate

小狗puppyUID: 2129370

这个题用常识判断就是D，自然界很多生物在条件不好的情况下都会有对策
Lichens are famous for their ability to survive ~ water shortage

小狗puppyUID: 2129370

答案好象很有问题

hankvision1UID: 2143859

C根本就没有提到。可以看看汉客阅读笔记0401。答案D

链接在下面

binbin250000UID: 2142376

谢了