C. He is probably not very familiar with the person he has called.

　　D. He may need a rest between dialing and speaking.

　　51. People tend to make mistake when ____.

　　A. they perform several challenging tasks at a time.

　　B. new messages are processed one after another

　　C. their relationships with others are affected

　　D. the tasks require little thought

　　52. What is the main idea of the passage?

　　A. Multitasking has become a way of life.

　　B. Multitasking often leads to efficiency decline.

　　C. Multitasking exercises need to be improved.

　　D. Multitasking enables people to remember things better.

　　B

　　Intemet dating has become one of the biggest and most successful business ventures on the Intemet．Basically，Internet dating is a way to meet people for either friendship or dating without actually having to meet them in person first·

　　The 6rst thing t。do if you decide t。try Internet dating is to build your profile(简介)which can include your hobbies，hopes for the future，and So on．A photograph is optional，but many sites claim that a photograph increases the number of people who look at your profile·Many Internet dating sites will charge a one-time registration fee to use their services·

　　Internet dating makes it possible to meet people from all over the world·You call even narrow thesearch down to your area by zip code．Another advantage is that you can communicate by

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