2013年职称英语理工类c级阅读理解练习9_第2页

　　41. Backpacks are convenient because
　　A they can be very large.
　　B they can hold as many things as you want to carry.
　　C your hands are freed to do other things.
　　D you do not have to carry things with you.
　　42. What is the most important feature of the backpack invented by Lawrence C. Rome and his colleagues?
　　A It produces electricity for electronic devisees while the wearer walks.
　　B It can be used as cell phones, GPS in the military actions or field studies.
　　C It is small and convenient.
　　D It is light and easy to carry.
　　43. The word "springs" in Paragraph 3 means
　　A a small stream of water flowing naturally from the earth.
　　B the season of the year, occurring between winter and summer.
　　C the act or an instance of jumping or leaping.
　　D a length of metal wound around, which returns to its original shape after being pushed.
　　44. According to Paragraph 4, what does Rome plan to do?
　　A To make the backpack more comfortable for the wearer.
　　B To put the backpack on the market.

　　C To test the advantage of the backpack.
　　D To promote the backpack in a newspaper or on television.
　　45. What is implied in "if you do gut one eventually, just make sure to look both ways before crossing the street!"?
　　A You will Be too excited to watch the traffic.
　　B Enjoying electronic devices while walking may invite traffic accidents.
　　C It is not possible for you to get such a backpaek.
　　D It is wise of you to have such a backpack.