广域网可以跨越分布在不同地区的多个网络，目前，其通信子网共享信道主要使用A．线路交换

Most people trade money for entertainment. Movies, concerts, and shows are enjoyable but expensive. If you think that you can’t have a good time without spending a lot of money, read on. A little resourcefulness and a few minutes of newspaper-scanning(浏览) should give you some pleasant surprises.

People may be the most interesting show in a large city. Walk through busy streets and see what everybody else is doing. You will probably see people from all over the world. you will certainly see people of every age, size and shape, and you will get a free fashion show, too. window-shopping is also a safe sport—if the stores are closed.

Check the listing in your neighborhood paper. Local colleges or schools often welcome the public to hear an interesting speaker or a good debate. The film or concert series at the local public library probably won’t cost you a penny. Be sure to check commercial(商业的) advertisements, too. A flea(跳蚤) market can provide hours of pleasant browsing. Perhaps you can find a free cooking crafts demonstration in a department store.

Plan ahead for some activities. It is always more pleasant not to have people in front of you in a museum or at a zoo. You may save some money, too, since these places often set aside one or two free admission days at slow times during the week. Pretend that you are a tourist from time to time, and get to know our city all over again including the indispensable sights that people travel miles to see. If you feel like taking an interesting walk, find a free walking tour, or plan one yourself. You will see your city in a new perspective once you know more about its history or its architectural(建筑的) treasures. With imagination and spirit of adventure you can quite easily find good entertainment at no cost at all.

小题1: Which of the following statements is NOT true according to the passage?

A．There are many kinds of amusements you can enjoy without spending much money.

B．You should be a tourist if you want to know more about the city you live in.

C．The film shown at the local public library is often free of charge.

D．Local colleges often hold meetings to debate the issues people are interested in.小题2:“You will certainly see people of every age, size and shape.” “Shape” here refers to people

being ____.

A．old and young

B．beautiful and ugly

C．tall and short

D．fat or thin小题3:If you are wandering through the busy street, which attract you most?

A．Various buildings.

B．Car driving.

C．Free walking.

D．Window-shopping.小题4: The best title for the passage is ____.

A．Amusement at No Cost

B．Movies, Concerts and Shows

C．The Cheapest Window-shopping

D．The Most Enjoyable Street Musicians

呼吸暂停低通气指数为：（）

A.夜间睡眠1h内呼吸暂停和低通气的次数

B.夜间睡眠中每小时呼吸暂停和低通气的平均次数

C.夜间睡眠中每小时呼吸暂停和低通气的平均时间

D.7h的夜间睡眠时间内出现的呼吸暂停的平均次数

E.7h的夜间睡眠时间内出现的呼吸暂停的平均时间

三相半波可控整流电阻负载电路，当控制角α>（）时，出现输出电压波形断续。

A.15°

B.25°

C.30°

D.60°

下列不属于全国人民代表大会常务委员会委员长会议的组成人员的是：()

A．委员长

B．副委员长

C．秘书长

D．各专门委员会主任委员

肝硬化最严重的并发症

A．上消化道出血
B．肝性脑病
C．肝肾综合征
D．肝肺综合征
E．腹水