题目

关于摩擦力做功，下列说法正确的是A．滑动摩擦力只能对物体做负功B．静摩擦力只能对物体做正功C．滑动摩擦力可以对物体做正功D．静摩擦力可以对物体做负功 答案：CDMany people like to watch TV. There arc all kinds of programs on TV. The soap opera is one of them.The soap opera was first on the radio in the 1920s. Then it started on TV in the 1940s.Why do so many people like to watch soap operas on TV,' especially young people? What makes soap operas popular? Let's find out.First, what's happening in the soap opera is very different from our lives. Everthing is perfect in the play. People don't need to worry about almost anything. People don't have money problems.Second, there are many beautiful girls and handsome boys in the soap opera. They are cool. They make young people crazy. They make young people happy.Third, the story in the soap opera is usually in?teresting. It makes people relax after a day's hard work. Even some old people like to watch it, too.But some people don't like it. They think the show is too slow and too long. Do you like to watch soap operas? What do you think of them? (       )26.   The soap opera started on TV .      A.   in the 1920s       B.   in the 1930s        C.   in the 1940s       D.   in the 1950s (       )27.  The soap opera is       our lives.A.   very different fromB.    the same asC.    as interesting asD.   crazier than(       )28.        in the soap opera make young people crazy.A.   The money problemB.    The perfect storiesC.    The interesting stories        D.   The beautiful girls and handsome boys (       )29.  People like soap operas because        .  A.   the show is too slow and too longB.    they can make people sad  C.    they can make people relaxedD.   they started on TV early(       )30. Which of the following is NOT true according to the passage?A.   The people in the soap opera don't need to worry about almost anything.  B.    All people like soap operas.   C.    The story in the soap opera is usually interesting.D.   The girls and the boys in the soap op?era are usually cool.