2. 外语
  3. ENERGY USED PER METER VERSUS SPEED DURING RUNNING AND WALKING If s is a speed, in miles per hour, at which th

ENERGY USED PER METER VERSUS SPEED DURING RUNNING AND WALKING If s is a speed, in miles per hour, at which th

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问题             ENERGY USED PER METER VERSUS SPEED
                DURING RUNNING AND WALKING

If s is a speed, in miles per hour, at which the energy used per meter during running is twice the energy used per meter during walking, then, according to the graph above, s is between
选项 A、2.5 and 3.0
B、3.0 and 3.5
C、3.5 and 4.0
D、4.0 and 4.5
E、4.5 and 5.0
答案A
解析 This question is about the speed at which the energy used per meter during running is twice that used per meter during walking. Graphically, this is the speed for which the running energy is twice as high as the walking energy. Looking at the graph, you can see that for speeds greater than or equal to 3.0 miles per hour, the running energy is less than twice the walking energy, so the desired speed must be less than 3.0. In fact, the desired speed is between 2.0(the lowest speed on the graph)and 3.0. Looking at the answer choices, you see that there is only one answer choice that is between 2.0 and 3.0; namely, Choice A, which says the desired speed is between 2.5 and 3.0. The correct answer is Choice A.
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