单项选择题

In today' s society, the knowledge of a lifetime ______.

A．is still very much valued
B．become out of date quickly
C．is essential for continuing family occupations
D．helps the young generation to find a better job

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单项选择题

Which of the following statements is TRUE

A．Cell phones are not suitable for children to use.
B．Using cell phones very often may cause stress.
C．Your boss likes to be informed by your cell phone.
D．People can get in touch with each other at any time with cell phones.

单项选择题

One of the advantages of using cell phones is that ______.

A．it can make the relations between parents and their children closer
B．it can make people feel less stressed from their work
C．we can get some information as quickly as possible
D．we can know what to do under some emergency situations