Many people think the search for cleaner energy leads only to renewable resources like sun, wind and water. But it also leads to a fossil fuel. Natural gas is considered the cleanest of the fossil fuels, the fuel created by plant and animal remains over millions of years. Burning it releases fewer pollutants than oil or coal. The gas is mainly methane (甲烷). It produces half the carbon dioxide of other fossil fuels. So it may help cut the production of carbon gases linked to climate change.
Russia is first in what are called "proved reserves" of natural gas. The United States is sixth. Over the years, big oil and gas companies recovered much of the easily reached supplies of gas in America. They drilled straight down into formations where gas collects. As these supplies were used up, big drillers looked for similar formations in other countries.
But now the industry is taking a new look. Companies are developing gas supplies trapped in shale (页岩) rock two to three thousand meters underground. They drill down to the shale, then go sideways and inject high-pressure water, sand or other material into the rock. This causes the rock to fracture, releasing the gas. Huge fields of gas shale are believed to lie under the Appalachian Mountains, Michigan and the south-central states. Gas shale exploration is being done mainly by small to medium sized companies. Eric Potter, a program director, says more than half the gas in the United States is now coming from these new reserves.
But hydraulic (液压的) fracturing can also produce debate and anger over the risk of groundwater pollution. This method of drilling is not federally supervised under the Safe Drinking Water Act. Some in Congress want to end that exemption (豁免) from the law.
Natural gas provides Americans with about one fourth of their energy. And, unlike oil, most of it is produced in America. Gas producers invested heavily in reaching new supplies when prices were high. But prices are down sharply now because the depression cut demand for energy. So energy expert Eric Potter says it is too early to know how the changing market prices will affect the market for gas shale exploration.
68. We can learn from the first paragraph that ________.
A. natural gas releases methane and carbon dioxide
B. natural gas is considered as the cleanest energy
C. natural gas is more environmentally friendly than other fossil fuels
D. natural gas is a renewable source of energy
69. The word “fracture” in Paragraph 4 probably means _______.
A. create B. break C. change D. decrease
70. Gas shale exploration may cause disagreement because ______.
A. it may cause water pollution B. it brings too high profits
C. it breaks the law D. it is out of states’ control
71. According to Eric Potter, the new gas shale exploration ______.
A. will provide America with about one fourth of their energy
B. will increase demand for energy
C. will make gas producers invest a big sum of money
D. may be influenced by the changing market prices
Below is a table which shows the melting(液化)and boiling points of common substances.Study the table.Then do Numbers 4—7.
| Substance |
Melting point(C) |
Boiling Point(C) |
| Water Alcohol Nitrogen Oxygen |
0 –117 –210 -218 |
100 78 –196 –183 |
The underlined word‘substances'means‘a type of'_________.
| A．matter | B．liquid |
| C．solid | D．gas |
Which of the four should be a liquid at-90 degrees?
| A．water | B．alcohol |
| C．nitrogen | D．oxygen |
Mixing alcohol and water is often used to wash windscreens of cars during the wintertime because _________.
| A．it is easier for alcohol to change into gas |
| B．alcohol is not easily separated from water |
| C．alcohol freezes at lower temperature than water |
| D．the mixture is not expensive |
In order to change water from a solid to a liquid energy must be _________.
| A．removed | B．added |
| C．created | D．destroyed |
Perhaps the most famous theory, the study of body movement, was suggested by Professor Ray Birdwhistell. He believes that physical appearance is often culturally programmed. In other words, we learn our looks—we are not born with them. A baby has generally informed face features. A baby, according to Birdwhistell, learns where to set the eyebrows by looking at those around-family and friends. This helps explain why the people of some areas of the United States look so much alike, new Englanders or Southerners have certain common face features that cannot be explained by genetics (遗传学). The exact shape of the mouth is not set at birth, it is learned after. In fact, the final mouth shape is not formed until well after new teeth are set. For many, this can be well into grown-ups. A husband and wife together for a long time often come to look alike. We learn our looks from those around us. This is perhaps why in a single country area where people smile more than those in other areas. In the United States, for example, the South is the part of the country where the people smile most frequently. In New England they smile less, and in the western part of New York State still less. Many southerners find cities such as New York cold and unfriendly, partly because people on Madison Avenue smile less than people on Peachtree Street in Atlanta, Georgia. People in largely populated areas also smile and greet each other in public less than people in small towns do. Ray Birdwhistell believes that physical appearance ___________.
| A．has little to do with culture |
| B．has much to do with culture |
| C．is ever changing |
| D．is different from place to place |
According to the passage, the final mouth shape is formed _____________.
| A．before birth |
| B．as soon as one’s teeth are newly set |
| C．sometime after new teeth are set |
| D．around 15 years old |
Ray Birdwhistell can tell what area of the United States a person is from by __________.
| A．how much he or she laughs |
| B．how he or she raises his or her eyebrows |
| C．what he or she likes best |
| D．the way he or she talks |
This passage might have been taken out of a book dealing with ____________.
| A．physics | B．chemistry |
| C．biology | D．none of the above |
Jonathan James looks like just another kid about to graduate from high school. But this 19-year-old Swede is anything but ordinary, from the computer in his parents’ home he helps the US Federal Bureau of Investigation (FBI) find out the world’s most wanted cyber criminals (网络犯罪分子).
Jonathan first made headlines when he and another Swede, Fredrik Bjoerck, found out the maker of the “Melissa” virus (病毒) in March 1999. He came to the aid of the FBI again on May 7, finding out the suspected (嫌疑的) sender of the dangerous “I LOVE YOU” virus. The suspect was caught in Manila on May 8.
Jonathan’s special skills are in hot demand as officials around the world express alarm at the “virtual” crimewave. In between studying for final exams, hanging out with friends and refereeing his younger brother’s football matches, the quiet, gentle teenager also gives lessons on e-security (电子安全) to large companies. He reads a lot and exchanges information with other computer experts to know much about the latest tricks of the hacker (黑客) trade.
Many companies have already tried to employ him, but he is not interested at the moment. Instead, he plans to begin law school in the autumn at Sweden’s Uppsala University and start up his own e-security company.
Although he works with the FBI now, his family insists he’s just “a regular kid”. “Jonathan is a great kid, he has his friends and he does a lot more than just play with the computer,” his little sister Tessa said, adding that he helps the FBI because “he likes to help”, not because he’s looking for fame and recognition.
When the world was hit by the “Love Bug” virus, Jonathan was too busy preparing a speech on e-security to look into the problem. “Finally on May 7, I had some free time, so I began looking.” Within a few hours, he had found the suspect and e-mailed his method and results to the FBI. He said his work on the “Melissa” virus, which took three weeks to solve, was a big help in finding the suspect so quickly.
“This time I knew exactly where to start, I knew what to disregard and what to look at.” The passage mainly wants to tell us that ___________.
| A．Swedish kid helps FBI find out the most wanted cyber criminals |
| B．Jonathan is really a quiet, gentle and ordinary boy |
| C．many companies want the young computer expert to join in |
| D．any cyber criminals will surely be found out wherever they are |
The public started to know something about Jonathan just from _________.
| A．his helping the US FBI to find out the sender of the dangerous “I LOVE YOU” virus |
| B．his work together with Fredrik Bjoerck to find out the maker of the “Melissa” virus |
| C．his little sister’s talk about his good qualities as a regular kid and a good programmer |
| D．his speech on e-security to many computer companies after his fight against hackers |
From Jonathan’s success in finding out the sender of the dangerous ‘Love Bug” virus we can infer that _________.
| A．where there’s a will, there’s a way |
| B．experience is knowledge |
| C．hard work leads to success |
| D．failure is the mother of success |
What do we know about Jonathan?
| A．He is a good fame hunter with various abilities. |
| B．He is such a brave fighter that any criminal will feel afraid. |
| C．He is an expert on security, not interested in running a company. |
| D．He is a regular kid but does something unusual. |
Before a new type of airplane goes into service, every part of it is tested again and again. But there are two tests that are more important than all the others.
The first is called the “tank test”. A modern airplane must fly very high in the sky. Air must be pumped into the plane so that the passengers can breathe. The metal structure (结构) of the plane has to be very strong for this reason. When the plane is filled with air, the air presses against the skin of the plane inside. The pressure (压力) on a small window is like a huge foot that is trying to get out. If a small part of the plane were to fail, the plane would explode in the sky. To test the structure of the plane, the plane is lowered into a huge tank or container of water. Then it is filled with air. The pressure inside the plane is greater than it ever will be when it is high up in the air. Finally, there is an explosion. This does not cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane has broken. Then that part is made stronger.
The most dangerous test happens when the new plane is going through test flights in the air. The test pilot must find out exactly what happens when the engines (发动机) are all shut off at once. The plane begins to fall like a stone. It is the pilot’s job to find out how he can get control of the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.By doing the “tank test”, the engineers can find out ___________.
| A．the pressure inside and outside the plane |
| B．the strength of the plane structure |
| C．the amount of air in the plane |
| D．the power of the airplane engines |
What will happen to the plane under the “tank test”?
| A．It will be broken. |
| B．It will be made stronger. |
| C．It will be filled with water. |
| D．It will be tested by pilots. |
According to the text, why are test flights most dangerous?
| A．The engines may be damaged. |
| B．The pilot may lose control of the plane. |
| C．The plane may explode in the air. |
| D．Too much air may get into the plane. |
What might be the most suitable title for the text?
| A．Two Important Tests on Airplanes |
| B．The Danger of Testing Airplanes |
| C．The Importance of Flying Safely |
| D．How Airplanes Are Made and Tested |
Cara Lang is 13. She lives in Boston, Massachusetts, in the US. Last Thursday, she didn’t go to school. She went to work with her father instead. Every year, on the fourth Thursday in April, millions of young girls go to work. This is Take Our Daughters to Work Day. The girls are between the ages of 9 to 15. They spend the day at work with an adult, usually a mother, aunt, or uncle. They go to offices, police stations, laboratories, and other places where their parents or other family members work. Next year, the day will include sons, too.
The Ms. Foundation, an organization for women, started the program about ten years ago. In the US, many women work outside the home. The Ms. Foundation wanted girls to find out about many different kinds of jobs. Then, when the girls grow up, they can choose a job they like.
Cara’s father is a film director. Cara says, “It was very exciting for me to go to the studio with my dad. I saw a lot of people doing different jobs.” Many businesses have special activities for girls on this day. Last year, Cara went to work with her aunt at the University of Massachusetts. In the engineering department, the girls learned to build a bridge with toothpicks and candy. In the chemistry department, they learned to use scales. They learned about many other kinds of jobs, too.
Right now, Cara does not know what jobs she will have when she grows up. But because of Take Our Daughters to Work Day, she knows she has many choices. What is Cara’s father?
| A．An engineer. | B．An official. |
| C．A moviemaker. | D．A professor. |
According to the passage, Take Our Daughters to Work Day is __________.
| A．on every Thursday in April |
| B．a holiday for girls of all ages |
| C．a day for girls to know about jobs |
| D．a day for girls to get a job easily |
On this special day, Cara has done all the following EXCEPT that __________.
| A．she learned to use scales |
| B．she worked as an actress |
| C．she went to work with her aunt |
| D．she used toothpicks and candy to build a bridge |
What is probably the best title for the passage?
| A．Cara Lang, a Fortunate Girl |
| B．Take Our Daughters to Work Day |
| C．Children’s Day and Work Day |
| D．Ms. Foundation, an Organization for Women |