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解调是为了恢复信号
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传感器的输出信号一般比较微弱，一般都需要放大电路
Directions: In this section, you'll hear some long conversations. At the end of each conversation, some questions will be asked. Both the conversation and the questions will be spoken only once. After each question, choose the best answer from the four choices marked A, B, C, and D.Questions 1 to 3 are based on the conversation you have just heard.1.A . To play bridge.B . To have dinnerC . To study.D . To do physical exercise.2.A . Study should be set before recreation.B . Cooperating with your partner is very important.C . Spending time on a card game is a waste of time.D . Playing bridge is a good way to kill time.3.A . He has to do some part-time work to earn money.B . He has a heavy workload this semester.C . He is tired of playing cards.D . He doesn’t know how to play.Questions 4 to 7 are based on the conversation you have just heard.4.A . To make preparations for a new magazine.B . To learn how couples spend their Fridays.C . To know how housework is done at home.D . To investigate what people do at weekends.5.A . He goes to exercise classes.B . He stays at home.C . He goes to the concert.D . He goes swimming.6.A . On Fridays.B . On Saturdays.C . On Sundays.D . On any weekday.7.A . His surname.B . His address.C . His advertising agency.D . The name of the restaurant he often goes to.Questions 8 to 10 are based on the conversation you have just heard.8.A . Alex.B . Keira.C . Both of them.D . Neither of them.9.A . Jump with Alex.B . Do a jump herself.C . Watch Alex Jump.D . Teach Alex jumping.10.A . The company staff have a lot of safety procedures.B . The company staff will save them no matter what happens.C . They will bungee jump together with a lot of people.D . They are safe because they face their fears.
The writer had two different feelings before starting the race.
The British spectators in the stadium wanted the writer to win.
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