螺级JJ32有人考古吗？

非欧2011

最惊爆的是我貌似遇到了OG上的题目！！说的是澳大利亚的河流，在雨季的时候流量充足，在旱季的时候流速变慢，而且由于需要生活和灌溉，所以水更少了。然后冒出一个A生物，说这货在水流缓慢什么的环境下数量会增长，然后疑问为什么在极度干旱的情况下A数量怎么减少了。
我选的是：A在没有水的环境下无法生存。貌似是D？？？有人去OG考古么？

wenyeivan

62. When there is less rainfall than normal, the water level
of Australian rivers falls and the rivers fl ow more
slowly. Because algae whose habitat is river water
grow best in slow-moving water, the amount of algae
per unit of water generally increases when there has
been little rain. By contrast, however, following a
period of extreme drought, algae levels are low even
in very slow-moving river water.
Which of the following, if true, does most to explain
the contrast described above?
(A) During periods of extreme drought, the
populations of some of the species that feed on
algae tend to fall.
(B) The more slowly water moves, the more
conducive its temperature is to the growth
of algae.
(C) When algae populations reach very high levels,
conditions within the river can become toxic for
some of the other species that normally live
there.
(D) Australian rivers dry up completely for short
intervals in periods of extreme drought.
(E) Except during periods of extreme drought, algae
levels tend to be higher in rivers in which the
fl ow has been controlled by damming than in
rivers that fl ow freely.

夏子之酒

你已经考过了阿？ 解放了阿

非欧2011

你已经考过了阿？ 解放了阿

-- by 会员 夏子之酒 (2011/12/9 9:05:26)

我还木有，14号的飘过

非欧2011

62. When there is less rainfall than normal, the water level
of Australian rivers falls and the rivers fl ow more
slowly. Because algae whose habitat is river water
grow best in slow-moving water, the amount of algae
per unit of water generally increases when there has
been little rain. By contrast, however, following a
period of extreme drought, algae levels are low even
in very slow-moving river water.
Which of the following, if true, does most to explain
the contrast described above?
(A) During periods of extreme drought, the
populations of some of the species that feed on
algae tend to fall.
(B) The more slowly water moves, the more
conducive its temperature is to the growth
of algae.
(C) When algae populations reach very high levels,
conditions within the river can become toxic for
some of the other species that normally live
there.
(D) Australian rivers dry up completely for short
intervals in periods of extreme drought.
(E) Except during periods of extreme drought, algae
levels tend to be higher in rivers in which the
fl ow has been controlled by damming than in
rivers that fl ow freely.

-- by 会员 wenyeivan (2011/12/9 0:30:06)

谢谢你~