The hole in the earth's protective ozone layer（臭氧层）won't repair itself until about two decades later than had been expected, scientists announced.

The ozone layer blocks more than 90 percent of the sun's ultraviolet radiation（紫外线辐射）, helping to make life on Earth possible. For many dacades, ozone was depleted（削减） by chlorine and bromine gas in the air. A hole in the ozone layer formed over the Southern Hemisphere.

Computer models had forecast that the hole would fill back in by 2050. An improved computer model forecasts the recovery won't occur until 2068. The model, fed with fresh data from statellites and airplanes, was supported by the fact that it accurately reproduced ozone levels in the Antarctic stratosphere（平流层）over the past 27 years.

The ozone hole is actually more of a broad region with less ozone than ought to occur naturally. It is not limited to Antarctica, as is often believed.

Over areas that are farther from the poles like Africa or the US, the levels of ozone are only three to six percent below natural levels. Over Antarctica, ozone levels are 70 percent lower in the spring. This new method allows us to more accurately estimate（估计）ozone-depleting gases over Antarctica, and how they will decrease over time, reducing the ozone hole area.

Paul Newman, a scientist,said that the ozone hole has not started to become smaller as quickly as expected. They figure it will not become much smaller until 2018, after which time the recovery should proceed more quickly. And the hole will not be filled in again until 2065.

1.According to the passage, the ozone layer _______

2.The improved computer model is believable because _________

3.The underlined word “they” in the fifth paragraph refers to ________

 From my point of view, the theory that ______ by the scientist is not quite scientific.

完形填空（共20小题；每小题1分，满分20分）?

阅读下面短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项

Would you agree with the statement that a wish is born from an idea, a simple idea imagined in the mind? Back in the 19^th century two men had an idea which in the end became their great  36 . The efforts they had made were rewarded(奖赏) with their success that    37  world travel.

In 1903, the Wright Brothers (Wilbur and Orville) achieved their dream. They flew the world’s first power-driven, heavier-than-air machine by which they made free, controlled and sustained(持久的)   38 . Kitty Hawk, North Carolina(美国地名)   39  this important and memorable moment.

The dream started with an idea that was planted in their minds by a   40  given to them by their father. In the words of the boys, “Our father came into the house one evening with some object in his hands, and   41  we could see what it was, he threw it into the air. Instead of falling to the floor, the toy flew across the room   42  it hit the ceiling(天花板), where it finally sank to the   43 .” This simple toy attracted the Wright Brothers and started their lifelong   44  in human flight.

The Wright Brothers   45  learning new things.   46  they opened their own printing office and then in 1893 they opened a company where they repaired bicycles. But Wilbur had his mind set on something more   47 . He decided to pursue(致力于)   48 .

The brothers spent many hours researching,   49  their machines and making improvements. What started out as a   50  soon became a career. With determination and    51 they realized their dream in 1903.

The next time you hear or see an airplane or travel on one,   52  where it all started. A simple idea was developed in the minds of the two young men who didn’t have a university degree. They were not scientists in the   53  sense of the world.

What idea are you working on? Have you limited yourself by saying you are not a scientist or not   54  enough? Whatever the mind can think and believe, it can be   55 .

1.                A．time           B．dream          C．pressure  D．fortune

2.                A．combined       B．replaced        C．explored  D．changed

3.                A．flight           B．ride            C．contribution   D．achievement

4.                A．wanted         B．witnessed       C．proved   D．needed

5.                A．bicycle         B．airplane        C．document D．toy

6.                A．before         B．when          C．after D．while

7.                A．until           B．since           C．if    D．but

8.                A．desk           B．floor           C．street    D．road

9.                A．discovery       B．trip            C．interest   D．devotion

10.               A．considered      B．enjoyed        C．admitted  D．imagined

11.               A．Actually        B．Finally          C．Usually    D．Firstly

12.               A．average        B．powerful       C．exciting   D．fortunate

13.               A．dancing        B．singing         C．flying D．writing

14.               A．testing         B．watching        C．designing  D．examining

15.               A．hobby         B．gift            C．trouble    D．trick

16.               A．distinction      B．explanation     C．expression D．patience

17.               A．forget          B．ask            C．remember D．expect

18.               A．hopeful        B．true           C．wealthy   D．energetic

19.               A．funny          B．polite          C．outgoing   D．clever

20.               A．defeated       B．achieved       C．recognized D．organized

1.This passage is most probably ______.

2.     According to the “Experience” section, we can infer that Donald Sloan can be _____ .

3.     From the passage we can learn that Donald Sloan ______.

You Mi, a lovely and confident 17-year-old student, is the first Chinese high school student to appear on the cover of the popular young adults’ fashion magazine Seventeen.

“You is IN,” said Wang Lihua，Editor-in-Chief of Seventeen. “She is active and mature (成熟) because of her knowledge on everything from academic studies，to books on art，to movies. We find she’s the very style we’re looking for to represent young people’s attitudes.”

You also impressed Wang with her fluent English when they first met last year. As the hostess of an English broadcasting program at the High School Affiliated to Renmin University（人大附中）， You is always praised for speaking English almost like a native speaker. “I’ve built up my English by watching thousands of English DVDs since I was 10,” she explained.

But for You，watching isn’t enough. Last year，while in Senior 1， she met a talented (有才能的) boy who showed self-made DV movies at the English Corner in her school.

“I thought it was so cool and I knew that I should start making my own films，” she said. So she wrote a campus (校园) story, persuaded schoolmates to star in it and then began shooting a 30-minute DV movie，all in English. “I played one of the leading roles，actually I was everything in my film. I worked on it every day during the holidays,” she recalled. The movie finally became a big hit on campus，earning You a strong reputation（名气） as a DV movie director.

But this is not the only field she wants to master. Though a science student, You likes art, literature and fashion design very much.

“There are people who can be artists，there are people who edit books, and there are people who become film producers. But I just hope to mix all the things up!” she said. “There is an old saying I believe：Chances favor only the prepared mind.”

1.You Mi was chosen to be a cover of Seventeen, mainly because she _____.

2.You Mi’s fluent English is based on _____.

3.The author mentioned a talented boy to show _____.

4.In the 30-minute DV movie，You Mi didn’t act as a（n） _____.

5.We can learn from the passage that _____.