36.Two decades after the river dam was built, none of the eight fish species native to the river was still reproducing adequately in the river below the dam. Since the dam reduced the annual range of water temperature in the river below the dam from 50 degrees to 6 degrees, scientists have hypothesized that sharply rising water temperatures must be involved in signaling the native species to begin the reproductive cycle.
Which of the following most strengthen the scientists' hypothesis?
A.The native fish species were still able to reproduce only in side streams of the river below the dam where the annual temperature range remains 50 degrees.
D.The lowest recorded temperature of the river before the dam was built was 34 degrees,whereas the lowest recorded temperature of the river after the dam was built has been 43 degrees.
科学家认为温度的rising导致繁殖问题，那么D不正是讲的rising吗？不就加强科学家的推理吗？
答案却是A。。。。。why why why??anyone can tell me?
thanks!
hello?
回答此题送香吻一个muah!!.....O(∩_∩)O~
题目讲科学家认为温度影响了繁殖，A选项是排除他因，证明当温度不变的时候，没有影响繁殖
D 只是在prove题目的前提。
btw,香味在哪领？
这题是这样的，原文说的是本来水坝下游河流的温差是50度，装了大坝以后温差变为6度，科学家说大幅上升的温度是鱼类开始繁衍的信号。
(注意这里本来说的是温差也就是最高温度和最低温度。)其实原文的推论不是你想的那样。不是因为温度高所以鱼不繁衍。而是因为温差不够
大,这样就没有信号让鱼开始繁衍。
举个例子，比如 本来 冬天河水温度1度，到了春天河水温度20度，这样 温度变化了19度（sharply rising water temperatures ）让鱼开
有信号开始繁衍。
现在 冬天河水温度10度，到了春天只有14度（温度变化才4度）这样就没有sharply rising water temperatures 所以鱼不繁衍。
这题选项A说 在一个有温差还是50度的地方鱼繁衍了。所以就加强了
而 D的最低温度上升和原文是没有关系的。
不知道明白没有？
谢谢楼上滴哥哥，还有上上楼的那位色哥哥。。。。
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