The first paragraph hints (暗示) . The backpack’s electricity comes from .

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问题 The first paragraph hints (暗示) ______.
The backpack’s electricity comes from ______.

选项 A、the gears with battery-powered devices
B、the motion of the whole backpack while one walks
C、a mechanism with gears
D、an electrical generator

答案B

解析题目问“背包的电从哪里来?”文章第三段第二句说“人在走路时背包上下运动可以发电……”，这与选项[B]吻合。所以选项[D]为正确选项。

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