and his colleagues?
B It can be used as cellphones,GPS in the military actions or field studies.
D It is light and easy to carry.
A a small stream of water flowing naturally from theearth.
C the act or an instance of jumping or leaping.
being pushed.
A To make the backpackmore comfortable for the wearer.
C To test the advantage of the backpack.
5. What is implied in if you do get oneeventually,just make sure to took both
A You will be too excited to watch the traffic.
C It is notpossible for you to get such a backpack.
答案与题解:
2.A第二段的第一句说,Lawrence C.Rome及其同事们发明的这种背包,当背着背包走路时,会有电能产生;该段最后一句告诉我们,背包的这种性能可减少背包的重量,因为不必携带备用电池。
4.B 第四段最后一句的意思是:Rome计划将这种背包商业化,即推向市场。A、C、D在文中均未提到。D的意思是为背包做广告。
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