单项选择题

Which of the following was an important invention in the 19th century

A．Movies with sound.
B．Nylon.
C．The radio.
D．The computer.
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单项选择题
The speaker indicates that young people would not change their jobs so often and would fit for their jobs better if they______.
A．knew the jobs and themselves well
B．had a good curriculum in high school
C．happened to have the "one perfect job"
D．could get used to their working lives
单项选择题
Which of the following is NOT a function of the household system
A．The system can recognize your fingerprint.
B．You can call the refrigerator from the supermarket.
C．The system can call for help when there is a household problem.
D．The system can do the shopping for you.
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