冒泡排序在最坏情况下的比较次数是A．n(n+1)/2 B．nlog2n C．n(n-

Those who know _______ it was that wrote A Tale of Two Cities, raise your hands.

A．why

B．when　

C．how

D．who

宜饭后服用的药物是（）

A.功能峻下逐水者

B.对胃有刺激性者

C.用于驱虫者

D.用于安神者

E.用于补益者

男，7岁。右下后牙疼痛1周，脸肿3天。检查，大面积龋坏，Ⅱ度松动，叩疼（++），龈颊沟变浅，扪及波动感，扪疼（+），近中面深龋洞，叩诊（一），温度测试同对照牙。X线显示：Ⅳ根分歧大面积低密度影，远中根吸收2／3，恒牙胚牙囊不连续，上方骨板模糊不清。龋近髓，骨硬板连续。

初诊治疗方法是（）

A.拔除引液

B.开髓开放，口服消炎药

C.根管开放，口服消炎药

D.根管开放，脓肿切开

E.脓肿切开

阅读理解

     We often think of future. We often wonder what the world will be like in a hundred years' time.

      Think of space,  perhaps a permanent (永久的) station on the moon will have been set up. Perhaps

people will be able to visit the moon as tourists. Cheap rockets for space travel will have been developed, permitting long journeys throughout the solar system(太阳系). When that time comes, people will be

taking holidays in space and visiting other planets. Creat progress will have been made in medicine, too.

Perhaps a cure will have been discovered for the most terrible of all diseases-cancer. Pollution is a

problem we must solve. In a hundred years' time it will have been controlled.

     All the world will have been developed-even Antarctica. There will be large cities in Antarctica. We

already have supersonic (超音速的)  flight,  but in a hundred years' time we will have supersonic land

travel as well.

     We will have used up most of the earth's land tobuild our cities, so floating cities will have been built.

The Japanese already have plans for cities of this kind.And there will be cities under the sea. The first of

these will have been completed.       .

1. We will have developed _    in a hundred years' time, permitting long journeys all over the solar

    system.   

A. cheap rockets for space travel

B. a plane

C. a spaceship

D. a satellite

2. Man will also have supersonic land travel         .  

A. in a year

B. about half a century later

C.in the year 2050

D. about a century later

3. The last paragraph mainly talks about _         .   

A. we'll make good use of space on the earth

B. cities under the sea

C. Japan will first build floating cities

D. earth's land is in danger

下列货物出口程序中，哪一项最早进行？（）

A.通关

B.受理报检并计费

C.报检

D.检验检疫