1、Special Exercise2Cancer May Soon Be Worlds Leading KillerExperts say one reason is because more people are smoking cigarettes in developing countries._71_.They expect that by two thousand ten, cancer will become the worlds leading cause of death. Heart disease is the current leading killer. A World
2、Health Organization report made the predictions in December. Experts say one reason more people are dying from cancer is because more people are smoking cigarettes in developing countries. Forty percent of the worlds smokers are believed to live in China and India alone. _72_.Rates of breast cancer
3、in Japan, Singapore and South Korea are now three times what they were forty years ago.The W.H.O. report estimates that twelve million people will be found to have some form of cancer this year. It predicts that more than seven million people will die early as a result of cancer. And more than five
4、million of the new cancer cases will be in developing countries._73_.Experts are predicting the largest increases will be in China, Russia, and India.Without new treatments, the W.H.O. says, the number of new cancer patients could reach twenty-seven million a year by two thousand thirty. _74_.The Am
5、erican Cancer Society says governments can do things to help prevent the increase in cancer cases and deaths. One idea is to provide poor and developing nations with vaccines that help to prevent some cancer-causing infections. One example of a cancer-causing infection is human papillomavirus. This
6、virus can cause cancers in women. _75_.And the cancer society says health officials and governments should invest more in cancer research and early detection. A. Cigarette smoking in developing countries is causing more cancer deaths.B. Another suggestion is more support for tobacco-control programs
7、.C. The number of deaths could reach seventeen million a year. D. Health experts predict that soon, more people will die from cancer than from AIDS.E. The number of cancer cases and deaths from cancer are expected to increase one percent each year.F. Other things including high fat diets and reduced
8、 physical activity are also believed to be pushing the numbers upward. G. The number of smoking people in the developed countries is decreasing so fast that the diseases related to smoking are also decreasing so fast.Key:71-75DF EC BSpecial Exercise5Travel to some wonders in AmericaThere is one plac
9、e in America that almost everyone agrees is a man-made wonder: South Dakotas Mount Rushmore. Giant faces of four great American presidents are cut into the rock near the top of Mount Rushmore in the Black Hills. Each face is about eighteen meters high._71_.George Washington led the cause for indepen
10、dence. Thomas Jefferson represented the belief in equality. Abraham Lincoln ended slavery and saved the Union. And Theodore Roosevelt was a conservationist and symbol of the progressive spirit of America.We go next to one of the largest and most difficult structures ever built in the United States:
11、Hoover Dam. The dam is in the Black Canyon, near Las Vegas, Nevada. _72_.More than twenty thousand men worked on the project. It was very dangerous. Ninety-six workers were killed. Many others were injured. _73_.The Space Needle was built as the central structure for the nineteen sixty-two Worlds Fa
12、ir. Edward Carlson designed the one hundred eighty-four meter tall structure. The Space Needle has a wide base on the ground. It is narrow in the middle. On top is a large ring-like structure. The structure was meant to look like a “flying saucer,“ a vehicle that was popular in science fiction space
13、 travel stories. _74_.The restaurant slowly turns to provide visitors with a three hundred sixty degree view of Seattle. The Space Needle was not very costly. The building project cost about four million five hundred thousand dollars. It was designed and completed in about a year and opened on the f
14、irst day of the Worlds Fair._75_.And it remains the internationally known symbol of the city. AOur final man-made wonder is in the northwestern city of Seattle, Washington.BSo they remain mostly unchanged in the hundreds of years since they were built.CEach president represents important values in A
15、merica. DIt was completed in nineteen forty-one, after fourteen years .EIt controls the water of the Colorado River and produces electric power. FThe saucer includes an observation area and eating place.GToday, the Space Needle is the most popular place for visitors to Seattle.Key:71-75CEAFGSpecial
16、Exercises 4Not All Carrots Are OrangeWhen people think of carrots, they usually picture in their mind a vegetable that is long, thin and orange. But carrots come in many different sizes and shapes. _71_.For example, Paris Market carrots are about five centimeters around. Imperator carrots are thin a
17、nd about twenty-five centimeters long. And Belgian White carrots are, as their name suggests, white.For the best results, carrots should be grown in sandy soil that does not hold water for a long time. The soil also should have no rocks.To prepare your garden for carrots, dig up the soil, loosen it
18、and turn it over. _72_._73_.Experts say warm days, cool nights and a medium soil temperature are the best conditions for growing carrots that taste great.Carrots need time to develop their full sugar content. This gives them their taste. If they are harvested too early, they will not have enough sug
19、ar. But carrots lose their sweetness if you wait too long to pull them from the ground.The best way to judge if a carrot is ready to be harvested is by its color. _74_.Many people do not know that carrots can be grown during the winter months. If the winter is not cold enough to freeze the ground, y
20、ou can grow and harvest carrots the same way as during the summer months.If the ground does freeze in your part of the world, simply cover your carrot garden with a thick layer of leaves or straw. This will prevent the ground from freezing. You can remove the ground cover and harvest the carrots as
21、they are needed.Carrots are one of the worlds most popular vegetables. They can be cooked and prepared many different ways. _75_.AAdvice about growing one of the worlds most popular vegetables.B And not all carrots are orange.CThen, mix in some plant material or animal fertilizer.DWeather, soil conditions and age will affect the way carrots taste. E Usually, the brighter the color, the better the taste.FOr, once they are washed, they can be eaten just as they come out of the ground.GAnd they contain a lot of carotene, which the body makes into vitamin A.Key:71-75 BCDEF
