问题 问答题

据报道,由于人类目前对煤和石油的过度应用,以及一些天灾和人为的乱砍滥伐,使能吸收二氧化碳的大片森林在不断消失,导致空气中的二氧化碳(CO2)浓度增大,地球表面温度升高,形成了温室效应.科学家对二氧化碳(CO2)的增多带来的负面影响较为担忧,于是提出了将二氧化碳(CO2)通过管道输送到海底,这可减缓空气中二氧化碳(CO2)浓度的增加.请你根据二氧化碳(CO2)的性质回答:

(1)这样长期下去,将给海洋造成什么样的影响?

(2)你认为消除这些影响的最好方法是什么?

答案

(1)二氧化碳和水反应生成碳酸,所以这样长期下去,将给海洋造成海水的酸性将大大增强,从而破坏海洋的生态系统,带来不堪设想的后果;

(2)通过读题可知温室效应的根源是二氧化碳的增多,这主要是因为人类大量使用化石燃料所致,因此要想扼制温室效应的进一步发展,我们可以采取的措施有减少化石燃料的使用,公民要养成低碳生活习惯,大力植树造林,开发利用无污染的新能源.

故答案为:

(1)海水的酸性将大大增强,从而破坏海洋的生态系统,带来不堪设想的后果;(2)减少对煤和石油产品的用量,开发新能源,大量种植绿色植物等.

阅读理解

People who speak or perform before the public sometimes may suffer from “Stage Fright. ” Stage fright makes a person nervous. In the worst case(情况) it can make one's mind go back and forget what one ought to say,  or to act. Actors, musicians, dancers, lawyers, even radio show hosts(节目主持人) have suffered from stage fright at one time or another.

Diana Nichols is an expert in helping people free from stage fright at a medical centre in New York City. She helps actors learn to control themselves. Miss Nichols says some people have always been afraid to perform before the audience. Others, she says, develop stage fright after a fearful experience.

She offers them ways to control the fear. One way is to smile before going onto the stage. Taking two deep breaths also helps. Deep breathing helps you get control of your body.

Miss Nichols persuades her patients to tell themselves that their speech or performance does not have to the perfect. It's all right to make a mistake. She tells them they should not be too cautions(谨慎的) while they are performing. It is important that they should continue to perform while she is helping them. After each performance, they discuss what happened and find out what advice helped and what did not. As they perform more and more, they will fear less and less as much as 50%. Miss Nichols says the aim is only to reduce stage fright, not to eliminate it completely. This is because a little stage fright makes a person more cautious, and improves the performance.

1 One who is suffering stage fright may        .

A. forget one's part before the audience

B. smile all the time on the stage

C. make a speech fast than ever

D. be cautious to improve his performance

2 The underlined word “eliminate” in the last paragraph means        .

A. keep          B. reduce           C. change          D. get rid of

3 The wrong way to overcome stage fright is        .

A. to smile before going to the stage.

B. to take two deep breaths to calm oneself

C. to pay less attention to one's mistakes in performance

D. to perform less and to watch more

4 Which of the following statements is right?

A. We can get rid of stage fright completely.

B. A little stage fright can make actors perform better.

C. We can reduce stage fright as much as one third.

D. A little stage fright leads to complete failure.

单项选择题