Read the following article and select the best answer. Article: At age 61, identical twins Jeanne and Susan no longer look exactly alike. Susan smoked for many years and is an admitted sun worshipper, whose habits Jeanne does not share. A new study of twins suggests you can blame those coarse wrinkles, brown or pink spots on too much time in the sun, smoking, and being overweight. Because twins share genes, but may have different exposures to environmental factors, studying twins allows an "opportunity to control for genetic susceptibility ," Dr. Elma D. Baron, at Case Western Reserve School of Medicine in Cleveland, Ohio, and his colleagues explain in the latest issue of Archives of Dermatology. Their analysis of environmental skin-damaging factors in 65 pairs of twins hints that skin aging is related more to environment and lifestyle than genetic factors. But when it comes to skin cancer, the researchers say their findings support previous reports that both environment and genes affect skin cancer risk. Baron's team examined facial skin of 130 twins, 18 to 77 years old, who lived mostly in the northem Midwest and Eastern regions of the US, who were attending the Twins Days Festival in Ohio in August 2002. At this time, each of the twins also separately reported how their skin burned or tanned without sunscreen, their weight, and their history of skin cancer, smoking, and alcohol drinking. The study group consisted of 52 fraternal and 10 identical twin pairs, plus 3 pairs who were unsure of their twin status. From these data, the researchers noted strong ties, outside of twin status, between smoking, older age, and being overweight, and having facial skin with evidence of environmental damage. By contrast, sunscreen use and drinking alcohol appeared related to less skin damage. Baron and his colleagues say the current findings, which highlight ties between facial aging and potentially avoidable environmental factors--such as smoking, being overweight, and unprotected overexposure to the sun's damaging rays--may help motivate people to minimize these risky behaviors. Question: The passage is mainly concerned with _ . - skin cancer and environment - identical twins research - aging skin and environmental factors - genes and lifestyles
aging skin and environmental factors

Read the following article and select the best answer. Article: This week Faith Lapidus and Doug Johnson will tell you about Chuck Berry.Chuck Berry,born on October 18,1926,is often called the father of rock and roll.He is one of the most popular and influential performers of rhythm-and-blues and rock'n'roll music during the 1950s,1960s and 1970s. He started singing in church when he was six years old.His interest in music stuck with him.A lot of Chuck Berry's material is about teenage life,especially school.Chuck Berry left school when he was 17.He headed west with two friends,but they did not get far.They were arrested after they used a gun to steal a car in Kansas City,Missouri.He was set free after four years. Chuck Berry signed his first recording contract in 1955,with the company Chess Records.Because one of his early hits,"Rock&Roll Music", _ in the United States then,which was greeted with enthusiastic reviews.Many other famous bands copied it again and again. Filmmaker Taylor Hackford made a documentary called"Hail! Hail! Rock'n'Roll", named for a Chuck Berry song.It centered on the making of a concert to honor the musician on his 60th birthday in 1986.Guitarist Keith Richards from the Rolling Stones organized the concert.Listening to Chuck Berry songs got him interested in music.In Keith Richards'words,"I didn't dream I could make a living at it but that's what I wanted to do."More than 75 artists and bands have done their own versions of Chuck Berry songs. The Rock and Roll Hall of Fame in Cleveland,Ohio,included Chuck Berry in its first year of honors in 1986.The Hall of Fame had this to say:"While no individual can be said to have invented rock and roll,Chuck Berry comes the closest of any single figure to being the one who put all the essential pieces together." Thank you for your listening.Faith Lapidus and Doug Johnson were your announcers. Question: Which of the following about Chuck Berry is true? - Chuck Berry was the first to invent rock and roll on his own. - Chuck Berry was put into prison for leaving school in 1943. - Chuck Berry can be said to have formed rock and roll's basic structure. - Chuck Berry is the most popular and influential performer.
Chuck Berry can be said to have formed rock and roll's basic structure.

Q: Read the following article and select the best answer. Article: "Confidence" is probably one of the most noticeable traits in the Americans. They show confidence in the way they talk, the way they smile, the way they dress and the way they walk. Living and competing with all these confident American students, I find it extremely important to be confident as an international student and instructor. As a student, being confident means you should never hesitate to raise your hand whenever a question or a point comes to your mind. Don't mind if it sounds simple or silly. Otherwise you will never get a chance to speak in class at all. What's worse, the professors may think you are not prepared for the discussion or you do not have your own opinion on the issue--this is the last comment any graduate would like to receive. Being confident for me as a foreign instructor means calmly asking the student to repeat what he or she has said if I did not get it. Pretending to understand what you actually did not may just bring yourself embarrassment or even disgrace. But the time I most need to be confident is when my students come to my office and bargain about the grades I have given for their speeches. (The course I'm teaching here is Public speaking). Modesty is a trait highly valued in China, but it won't be of much help here if you want to survive and succeed in a good American graduate program. Question: A professor will have the worst opinion of a student who _ . - gives a silly or simple answer - tries to seize any chance to speak in class - shows no interest in the course - is considered to have no opinion of his own
A: is considered to have no opinion of his own

(Question)
Read the following article and select the best answer. Article: Flying over a desert in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour's flight one of the scientists wrote in his notebook, "Look here for probable metal." Walking across hilly ground, four scientists reported, "This ground should be searched for metals." From an airplane over a hilly wasteland a scientist sent back by radio one word "Uranium". None of the scientists had X-ray eyes: they had no magic powers for looking down below the earth's surface. They were merely putting to use one of the newest methods of locating minerals in the ground -- using trees and plants as signs that certain minerals may lie under the ground on which the trees and plants are growing. This newest method of searching for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow on the surface. At Watson Bar Creek, a mineral search group gathered bags of tree seeds. Boxes were filled with small branches from the trees. Roots were dug and put into boxes. Each bag and box was carefully marked. In a scientific laboratory the parts of the forest trees were burned to ashes andtested. Each small part was examined to learn whether there were minerals in it. Study of the roots, branches and seeds showed no silver. But there were small amount of gold in the roots and a little less gold in the branches and seeds. The seeds growing nearest to the tree trunk had more gold than those growing on the ends of the branches. If the trees indicated that there was no gold in the ground, the scientists wouldn't spare money to pay for digging into the ground. Question: Which of the following might be the best title for this passage? - Scientists searching for treasure with special equipment. - New methods of doing geological study. - Gold could be found in trees and plants. - A new method of searching for minerals.
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A new method of searching for minerals.