羊水过多合并胎儿畸形的处理原则是（） A.期待疗法 B.保胎治疗 C.抽取羊水 D.

实践与应用。   

你喜欢做游戏吗？把你喜爱的游戏给同学们介绍一下，注意说明游戏的玩法哟！

下列关于二氧化碳的叙述中，错误的是（　　）

A．“碳酸水”浇灌植物对植物光合作用有利

B．利用干冰可进行人工降雨

C．干冰用于制造舞台人造云雾

D．用澄清石灰水吸收空气中过量的CO₂，以解决温室效应

如图，某同学设计一个用自由落体法验证机械能守恒定律的实验

（1）除了图中已画出的器材以外，下面所列各项器材哪些是必须的__________。

A．低压交流电源   B．低压直流电源   C．天平和砝码 

D．刻度尺   E．弹簧秤   F．秒表

（2）实验步骤有：

A．把打点计时器固定在铁架台上，并用导线将打点计时器接在低压交流电源上

B．将连有重锤的纸带穿过限位孔，并用手提着纸带，让手尽量靠近打点计时器

C．松开纸带，接通电源

D．更换纸带，重复几次，选用点迹清晰且第1、2两点间距为2mm的纸带

E．用天平称出重锤的质量，利用mv²="mgh" 验证机械能守恒定律

在以上实验步骤中有错误操作的步骤是

①     ，正确的操作是                                                        。

②______，正确的操作是                                                        。

在以上实验步骤中有不必要的操作的步骤是

③_____，不必要的的操作是                                                     。

A new generation addiction is quickly spreading all over the world. Weboholism, a twentieth century disease, affects people from different ages.They surf the net, use e-mail and speak in chat reoms. They spend many hours on the computer, and it becomes a compulsive habit. They cannot stop, and it affects their lives. 

Ten years ago, no one thought that using computers could become Compulsive

behavior that could affect the social and physical life of computer users. This obsessive behavior has affected teenagers and college students. They are likely to log on computers and spend long hours at different websites.

They become hooked on computers and gradually their social and school life is

affected by this situation. They spend all free time surfing and don't concentrate on homework, so this addiction influences their grades, and success at schools. Because they can find everything on the websites, they hang out there. Moreover, this addiction to websites influences their soeial life.

They spend more time in front of computers than with their friends. The relation with their friends changes. The virtual life becomes more important than their real life. They have a new language that they speak in the chat rooms and it causes cultural changes in society,

Because of the change in their behavior, they begin to isolate themselves from the society and live with their virtual friends. They share their emotions and feelings with friends Who they have never met in their life.Although they feel confident on the computer, they are not confident with real life friends they have known all their fife. lt is a problem for the future. This addictive behavior is beginning to affect the whole world.

小题1: The passage is about               

A．the cause of weboholism

B．the advantage of weboholism

C．the popularity of weboholism

D．the influence of weboholism小题2:The underlined word"obsessive" in the second paragraph most probably means    

A．attractive

B．addictive

C．professional

D．potential小题3: We can learn from the passage that               .

A．weboholism has the greatest effect on teenagers

B．teeangers can hardly balance real and virtual life

C．people are addicted to games on the lnternet

D．virtual life is more vivid and attractive anyway小题4: Which of the following is NOT true of weboholism?

A．It contributes to the development of the web.

B．The chat room language may change social culture.

C．The problem will have a negative influence on our future.

D．People addicted to the web often become inactive in real life.小题5:The author's attitude towards weboholism is that of being         

A．objective

B．positive

C．opposed

D．acceptable

Widndows98提供两种基本操作方式，即键盘操作、（）。