单选题
In near future people relying on battery-powered devices to get around and do their work don't need to give up space in their packs to lots of extra batteries because ______.
A、
their heavy packs can make electricity
B、
battery-powered devices will be improved a lot
C、
they typically carry heavy backpacks
D、
global positioning system (GPS) receivers and night-vision goggles work themselves
【正确答案】
A
【答案解析】
[精解] 文章理解题。题干的意思是：在将来，靠那些要电池提供能源的设备的人们，在收拾行李外出工作时不必再在背包里留许多出空间来装电池，这是因为……根据全文意思很容易得出选项[A]为正确答案，因为选项[A]的含义是“他们的沉重的背包可以自己发电。”
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