Karaoke has turned into a very large industry since being invented in 1971 by Daisuke Inoue，a worker in a club in Japan who was looking to provide music for a customer who wanted to sing on a company trip.

Asked what people would like to see invented in the future,18 percent said a robot cleaner and 16 percent said a time machine.Asked what the most important safety inventions were,69 percent said the smoke alarm,64 percent said seat belts and 29 percent said baby seats.

21．What do we learn from the survey?

A．Half the people surveyed wished karaoke machines hadn’t been invented.

B．Smoke alarms embarrass people a lot in many cases.

C．Alarm clocks are a must for everyone.

D．Some people are not satisfied with mobile phones.

22．The underlined word “It” in Paragraph 3 refers to the fact that________.

A．people who can’t perform sing karaoke

B．many drunks go and sing karaoke

C．people enjoy themselves by singing karaoke

D．people watch others perform

23．According to the passage，the karaoke machine________.

A．needs to be improved

B．was invented in the 19th century

C．gives a lot of people the chance to sing

D．was invented by a British person

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