甲欠乙2万元钱，约定1个月后还清，由丙保证1个月。1个月还款期到而甲未还，此时，丙的保证责任消灭。()
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The use of E-mail has made it possible for the writer to______.
A. spend less time working
B. have more free time with his child
C. work at home on weekends
D. work at a speed comfortable to him
The purpose of this passage is to______.
A. explain how to use the Internet
B. describe the writer's joy of keeping up with the latest technology
C. tell the merits(价值) and usefulness of the Internet
D. introduce the reader to basic knowledge about personal computers and the Internet
According to the writer, E-mail has an obvious advantage over the telephone because the former helps one______.
A. reach a group of people at one time conveniently
B. keep one's communication as personal as possible
C. pass on much more information than the later
D. get in touch with one's friends faster than the latter
A．wayB．pathC．roadD．street
A. way
B. path
C. road
D. street
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