The days are gone ________ we use “foreign matches”.

A. during when　　　　　　  B. during that　　　　　　    C. on which　　　　　　　　  D. during which

A. during when　　　　　　  B. during that　　　　　　    C. on which　　　　　　　　  D. during which

Force other than damaging winds are also at work inside tornadoes. Sometimes, as the turning, jumping funnel(漏斗) passes over a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion(爆炸) is caused by the low air pressure at the center of a tornado.

The pressure at the center of a tornado is usually 13 pounds per square inch. However, inside the house the air pressure is normal, about 15 pounds per square inch. The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado funnel passes over a small building that measures 20 by 10 by 10 feet. On each square inch of the building, there is 2 pounds of pressure from the inside that is not balanced by air pressure outside the building. On the ceiling, that adds up to an unbalanced pressure of 57,600 pounds. The pressure on the four walls adds up to 172,800 pounds.

If windows are open in the building, some of the inside air will rush out through them. This will balance the pressure inside and outside the building. But if the windows are shut tightly, the great inside pressure may cause the building to burst.

　　Unfortunately, heavy rain happens in thunderstorms that later produce tornadoes. So, people often shut all windows to protect their property. This may cause far worse damage later.

63. Which of the following is the main topic of the passage?

A. Where tornadoes are formed.  　　      B. When tornadoes usually occur.

C. How tornadoes can be prevented.　　     D. Why tornadoes cause so much damage.

64. According to the passage, tornadoes can destroy building because the _____.

A. force of a tornado increases the air pressure in a building

B. air pressure at the center of a tornado is over 172,000 pounds

C. weight of a tornado can crush a building’s roof when it passes overhead

D. air pressure inside a tornado is less than the air pressure inside a building

65. According to the passage, the pressure on a building during a tornado can be reduced　　　　by _____.

A. closing the windows 　　　　　        B. opening the windows

C. using an electric fan 　　　　          D. making the roof and walls stronger

Listening to music can help me focus better. Since I discovered it two years ago，I've used music to get through boring work or to focus creatively. I've found that it can make even the dullest jobs enjoyable and help clear mental blocks to creativity.

I first noticed the good effects of music while playing video games. It was a few days before Christmas in 2005 and I was playing online video games. My parents had just given me a new MP3，so I decided to listen to music through the headphones while I played. After a few minutes I noticed a great change in my style of play. I was playing more naturally. The music relaxed me，and，to a certain extent，distracted me from the game，allowing my subconscious(潜意识的)talent to come through. The music also helped me block out the outside world. With those headphones on I was like a machine，moving from one task to the next without unnecessary thoughts or actions.  

Music can also have a great effect on mood. If I'm in a bad mood at work，I'll listen to some of Bob Marley's and get down to business. It always takes my mind off what I'm doing and makes me a happier person. The same is true for classic rock. One summer，I did a boring job collecting bottle openers by hand. Without a radio playing classic rock in the background，I would have hated life.

Listening to music with relaxing rhythms and a positive message helps you forget your work and think happy thoughts. But the results you see will depend heavily on your personal tastes. Experiment with the types of music you listen to during certain tasks. By trial and error you'll finally discover your best choice.

I'm always looking for new concentration aids，so I'd love to know what type of music works best for me.

1.We can infer that the passage was written in ________.

2.The author first discovered the effects of music ________.

3.The author mentions the experience of collecting bottle openers in Paragraph 3 to ________.

C
　　The curtain on the 2008 US presidential election finally rose last month as Requblican Senator(参议员) John McCain and Democratic Senator Barack Obama were formally selected as candidates of the two major parties.This may be one of the hardest decisions voters have to make between two appealing candidates.The big question for voters,as they face both an economic downturn and international threats,is :who will they elect? A young first - term senator promising change and new ideas,or a longtime senator with strong military experience and a reputation as a maverick(特立独行的人)？
　　American voters have never seen a candidate quite like Obama.He has a white mother from the US and a black fater from Kenya who left the family when Obama was very young.He spent part of his youth in Indonesia.
　　However,McCain has a very different life story.
　　He grew up in a Navy family and was a daring pilot during the Vietnam War in the 1960s. When Obama was in kindergarten in Indonesia,McCain's plane was shot down over Ietenam and he became a prisoner of war.McCain could have been set free if he disowned America but he refused and so was held for five years.
　　"We need a president who is very,very old,"McCain joked at his age as many others do.If elected,he would be 72 when he takes office and the oldest man to step in.
　　So in the end,the election may depend on several factors that are hard to judge:Will Obama's race matter to a significant number of voters ? Will workingclass whites who tended to support his primary (党内初选) oponent,Hillary Clinton,vote for Obama? And perhaps most important of all,will uncertain voters be more attracted to Obama's vision or to McCain's experience?
　　Whatever happens,one thing is clear,however:Whoever walks into the White House on January 20,2009,will find huge challenges waiting for him in the Oval Office,both at home and abroad.
　　64.______makes the result of the election hard to predict.
　　　A.Whether working class whites care about Obama's inexperience
　　　B.The economic trouble the country now faces
　　　C.Who uncertain voters will finally decide to vote for
　　　D.McCain being too old to govern the country
　　65.The appeal in Obama as a presidential candidate lies in _________
　　　A.his multi - cultural background
　　　B.his belife in tradition
　　　C.his inexperience in politics
　　　D.his fantastic promises
　　66.The word "disown" in Paragraph 6 means closest to ______.
　　　A.flee from
　　　B.turn his back on
　　　C.not keep it private
　　　D.expose secrets about
　　67.The challenges that will face the new preident______.
　　　A.are not mentioned in the text
　　　B.include buklding a strong party and a friendly image
　　　C.refer to the problems of immigrants and economy
　　　D.refer to the problems of economy amd international relations