Read the following article and select the best answer. Article: Geologists have been studying volcanoes for a long time.Though they have learned a great deal,they still have not discovered the cause of volcanic action.They know that the inside of the earth is very hot,but they are not sure exactly what causes the great heat.Some geologists have thought that the heat is caused by the great pressure of the earth's outer layers.Or the heat may be left from the time when the earth was formed.During the last sixty years scientists have learned about radium,uranium,thorium,and other radioactive elements.Many scientists now believe that much of the heat inside the earth is produced by radioactive elements. Whatever the cause of the heat may be,we do know that the earth gets hotter the farther down we dig.In deep mines and oil wells the temperatures rise about 1degF for every 50 feet.At this rate of the temperature 40 miles below the earth's surface should be over 4 000deg.This is much hotter than necessary to melt rock.However,the pressure of the rock above keeps most materials from melting at their usual melting points.Geologists believe that the rock deep in the earth may be plastic,or puttylike .In other words,the rock yields slowly to pressure but is not liquid.But if some change in the earth's crust releases the pressure,the rock melts.Then the hot,liquid rock can move up toward the surface. Question: The cause for the great heat inside of the earth is _ . - great pressure of the earth's outer layers - the heat left from the time when the earth was formed - radioactive elements giving out heat - not sure
not sure

Read the following article and select the best answer. Article: Kiss of Death is a romantic detective story whose basic theme focuses totally on dogs. Whitney Marshall had just gone through a divorce, appearing practically penniless while her husband, a promising plastic surgeon, was left with the property and the debts, and his new wife. Whitney seeks help from her cousin, Miranda, who had lived with them as a child. Miranda is operating a dog walking business and lives in the caretaker's cottage of one of her employers, Calvin Hunter. Whitney's approach is timely as Miranda is getting married and leaving for a two- week honeymoon. She leaves her house and the dogs in Whitney's care. Living next door is Adam Hunter; an expert of the Iraqi war who had suffered a battle injury. During his recovery, his uncle Calvin had asked Adam to his home in prefix = st1 /Greecetelling him that he was certain someone was likely to murder him. His uncle Calvin recently died of an apparent heart attack and Adam has come to Calvin California home to straighten out his affairs and to further investigate the death. Adam is from the area, and was previously called up in the security business with his former police partner. Immediately after Calvin's death, his home had been broken into and the only things stolen were his computer and related things. Adam has an accountant trying to sort out his uncle financial affairs. His uncle had become fascinated to a pet dog who had "taken Westminster by storm,"and had caught the dog show fever, spending his time judging and attending shows. To the surprise of all, however, there does not seem to be any money in his accounts. Whitney and Adam meet when he catches her in the house. Whitney is merely dealing with Calvin's dog, one of her new responsibilities. They continue to meet as outside causes throw them together and romance starts. Whitney's former husband Ryan tries to persuade her to sign a deal over to him that he claims he had not been properly taken care of in the divorce. She is hesitating, waiting to see a lawyer. Then, Whitney's dog is... Question: This passage is most probably part of _ . - life story of the author of Kiss of Death - an article by a literary reviewer - a book-seller's advertisement - a diary by a real detective
an article by a literary reviewer

Read the following article and select the best answer. Article: Petroleumis a very important mineral. It gives us heat and light. It gives us power for our cars, planes, and ships. Also, it gives us power for machines of all kinds. How is petroleum formed? Scientists believe petroleum comes from the remains of plants and animals (Remains are what is left after a plant or animal has died.) What exactly is petroleum? Petroleum is a mineral that is a mixture of hydrocarbons. It is an oily liquid, which may be brown, green, or black in colors. The word "petroleum" comes from Greek. It means "rock oil". Crude (, ) oil is petroleum that comes directly from deep in the ground. It is then taken to a refinery. a refinery is a kind of factory to refine oil. At a refinery the crude oil is separated into many parts. From the refined petroleum we get important things, such as gasoline, kerosene, fertilizer, detergents and a lot of other useful things. In fact, there are thousands of such things that we can get. Petroleum really is of great value! Question: This passage is most likely taken from _ . - a fairy tale - a novel - a popular science magazine - a scientist's diary
a popular science magazine

Read the following article and select the best answer. Article: If music makes you smarter, and exercise helps brain function, can exercising to music really boost brainpower? Some researchers said it could. Volunteers who listened to Vivaldi~ "Four Seasons" while working out on a treadmill did much better on a test of verbal ability than when they exercised without music, a team at prefix = st1 /OhioStateUniversityfound. "Evidence suggests that exercise improves the cognitive performance of people with coronary artery disease ," said psychologist Charles Emery, who led the study. "And listening to music is thought to enhance brainpower. We wanted to put the _ together," Emery added in a statement. Writing in the latest issue of the journal Heart & Lung, Emery and colleagues said they studied 33 men and women taking part in a cardiac rehabilitation program after having bypass surgery, angioplasty or other procedures to treat clogged arteries. The volunteers said they felt better emotionally and mentally after working out with or without the music. But their improvement on the verbal fluency test doubled after listening to music on the treadmills ."Exercise seems to cause positive changes in the nervous system, and these changes may have a direct effect on cognitive ability," Emery said. "Listening to music may influence cognitive function through different pathways in the brain. The combination of music and exercise may stimulate and increase cognitive arousal while helping to organize cognitive output." Emery said he now wanted to test people using music of their own choice. "We used The Four Seasons' because of its moderate tempo and positive effects on medical patients in previous research," Emery said. "But given the range of music preferences among patients, it's especially important to evaluate the influence of other types of music on cognitive outcomes." Question: We can infer that Emery's next step will be - to let the volunteers to listen to music of their own choice - to choose volunteers of different ages - to let the volunteers to listen to moderate tempo music - to test whether music can help recovery
to let the volunteers to listen to music of their own choice