2. 外语
  3. A researcher has found that the number of work hours needed to type in 5 words is directly proportional to the square root of s.

A researcher has found that the number of work hours needed to type in 5 words is directly proportional to the square root of s.

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问题 A researcher has found that the number of work hours needed to type in 5 words is directly proportional to the square root of s. If 2 work hours are needed to type in 2000 words, how many hours are needed to type in 4000 words?
选项 A、 
B、 
C、 
D、 
E、 
答案A
解析 第一句话中有比例表达“directly proportional to”。定位成比例的两个数量为the number of work hours needed to type in s words(输入s个单词所需要的工作时间)和the square root of s()。设工作时间为t，比例为k，则转化为表达式t=。因为输入2000个单词需要2小时，所以2=，解得k=。则输入4000个单词需要的时间

选择A选项。
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