How do you feel after you've stayed up late to finish schoolwork? Or the day after a slumber party? Scientists now say that your answers to these questions may depend on your genes. Genes are stretches of DNA that work like an instruction manual for our cells. Genes tell our bodies and brains what to do. People have about 40,000 genes, and each gene can have different forms. So, for example, certain forms of some genes make your eyes blue. Other versions of those genes make your eyes brown. In a similar way, new research suggests that a gene calledperiod3affects how well you function without sleep. The discovery adds to older evidence thatperiod3helps determine whether you like to stay up late or get up early. Theperiod3gene comes in two forms: short and long. Everyone has two copies of the gene. So, you may have two longs, two shorts, or one of each. Your particular combination depends on what your parents passed on to you. Scientists from the University of Surrey in England studied 24 people who had either two short or two long copies ofperiod3. Study participants had to stay awake for 40 hours straight. Then, they took tests that measured how quickly they pushed a button when numbers flashed on a screen and how well they could remember lists of numbers. Results showed that the people with the short form ofperiod3performed much better on these tests than the people with the long form did. In both groups, people performed worst in the early morning. That's the time when truck drivers and other night-shift workers say they have the most trouble concentrating. After the first round of experiments, participants were finally allowed to sleep. People in the group that performed well on the tests took about 18 minutes to nod off. People with the longperiod3gene, by contrast, fell asleep in just 8 minutes. They also spent more time in deep sleep. That suggests that people with the long form of the gene need more and deeper sleep to keep their brains working at top form. We can know from the passage that genes can not _ . A) tell our bodies and brains what to do B) make our eyes blue or brown C) decide how well you work without sleep D) ensure whether you're good at driving
D
Oprah Winfrey, the American media queen, is undoubtedly one of the most successful women in the world. She's the host and owner ofThe Oprah Winfrey Show, which continuingly wins high ratings, and the founder of Harpo Productions, which produces her television shows and movies. Certainly Winfrey feels right these days. Early on, however, _ . She stayed with her grandmother after birth and moved to Wisconsin to live with her mother at 6, and hence began the most difficult period in her life. They lived in the low-income community and her mother showed her less attention. Her classmates came from families with more money and she couldn't participate with them in a lot of activities. The young girl had held too much anger and pain inside and she rebelled. She repeatedly ran away from home and got into various troubles. During that time, she turned heavy smoker, became addicted to alcohol and drug and was sent to a juvenile detention home at the age of 13. Fed up, Oprah's mother sent her to Tennessee to live with her father. To a large extent, this man saved Oprah's life and helped pave the way for her success. She received a full scholarship to Tennessee State University where she majored in Speech and Performing Arts. After graduation, she landed a job as a news reader at a television station, where she did not do well at first. But she did not give up; instead, she worked harder. She put in long hours and prepared carefully before going on camera. Her hard work paid off: she moved up swiftly to news reader and reporter in Baltimore and was offered her own talk show in 1977. From then on, her career began to take off. Some people are handed money at birth and are nurtured into success; other people create their own success, and Oprah Winfrey definitely belongs to the latter. "There is no such thing as failure in my life," she concluded, "Life is a marathon. I think the ones who survive in life do it by hammering at it one day at a time." Well, by doing so, she won the game. Which of the following can best serve as the title of this passage? A) Oprah Winfrey, from a problem girl to the American media queen. B) Oprah Winfrey, from a news reader to a marathon winner. C) Even famous people have a disgraceful past. D) All that glitters is not gold.
A
(Q).
In prefix = st1 /America, drivers' education is part of high school. Every student in his or her second year of high school is required to take a course in drivers' education. However, unlike other courses, it isn't given during the regular school year. Instead, it is a summer course. The course is divided into two parts: class time for learning the laws and regulations, and driving time for practice. The students study the basic traffic laws they must know to pass the written driving test, which is given to anyone who wants to get a driver's license. Driving time is a chance for the students to sit behind the steering wheel and practice all kinds of skills that are required to drive a car. Each student is required to drive for a total of six hours. The students are divided into groups of four. The students and the instructor go out driving for two hours. Thus, each student gets half an hour of driving time per outing. The instructor and the "driver" sit in the front seats and the other three students sit in the back. The cars for drivers' education are different from other ears. In this kind of car there are two sets of brakes, one on the driver's side and the other on the instructor; s side. Thus, if the student driver runs into difficulties, the instructor can take over. This kind of car also has another special feature. On the rear window of the car is a sign that reads: STUDENT DRIVER. That lets nearby drivers know that they should be more careful because the student driver isn't very experienced. After the student has passed the drivers' education course and reached the proper age to drive, they can go to a designated state office to take the driving test, which is made up of an eye examination, a written test, and a road test. The student must pass all the three tests in order to get a driver's license. If the student does well in the drivers' education class, he or she will have no problem passing the test with flying color1s and getting licensed. We can infer that the students are required to_in their whole driving practice. A) go out driving for twelve times B) spend at least six hours driving C) drive for two hours D) get half an hour driving each time
(A).
A