49. Which of the following shows the right number of drivers who use cell phones while driving?

　　50. The underlined word" potential" in Paragraph 3 probably means

　　.

　　A. serious

　　B. possible

　　C. common

　　D. obvious

　　51. It can be inferred that

　　.

　　A. there isn't hard proof that using cell phones while driving will cause more accidents

　　B. some districts will no longer allow drivers to talk on hand-held cell phones

　　C. people hold different opinions as to whether cell phones use in cars should be limited

　　D. only two states have passed laws to ban drivers using cell phones while driving

　　52. The main purpose of this text is to

　　.

　　A. encourage drivers to use handsfree cell phones

　　B. inform people about cell phones use while driving

　　C. state some information about cell phones

　　D. tell people about the driving laws

　　D

　　Throughout our childhood our parents taught us to say "thank you" and it has become a habit -- something we say automatically, along with "please". And because of this we have forgotten just how important gratitude is and how essential it is in leading fuelled (感到满足的) lives.

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