An annoying problem for humans, who like to boast about all the distant planets and moons we have explored, is that we've never taken a good look right under our noses. The inside of the earth is relatively close, but how can we get there? The deepest oil well enters a mere six miles into the crust (the center of the earth is about 4,000 miles deeper). Russian scientists dug the deepest hole in Siberia, but bottomed out at about 7.5 miles below the surface. The Mohole project, a U.S. plan in the 1950s, called for drilling a hole 25 miles down to the boundary between the hard rocks of the crust and the soft mantle . Sadly the project involved government supporting. It gets harder and harder to drill deep into the earth because rocks get softer and softer. Hard but easily broken at the surface, rocks become plastic at depth, and the pressure caused by the weight of the overlaying crust --- about 52,800 pounds per square inch at a depth of ten miles, makes further drilling impossible. What little we know about the inside of the earth (like the fact that there's a crust, a mantle, and a core) comes from indirect evidence, such as the analysis of earthquakes. So maybe it's time for a thorough new method to explore the earth's inside. Scientist David Stevenson says we should forget about drilling holes. Instead, we should open a crack . Stevenson suggests digging a crack about a half mile long, a yard wide, and a half mile deep (not with a shovel) but with an explosion on the scale of a nuclear bomb. Next, he'd pour a few hundred thousand tons of molten iron into the crack, along with a robot. The iron, thicker than the surrounding crust, would move downward at about 16 feet per second, carrying the robot with it and opening the crack deeper and deeper. The iron mass would drop for about a week and 2,000 miles to the outer edge of the earth core, the robot sending out data to the surface. Stevenson compares his idea to space exploration. "We're going somewhere we haven't been before,"he says. "In all... Going inside the earth is _ than going into space. A) more interesting B) more possible C) easier D) more challenging
D
(Question)
One day I was walking home along the street with my iPod on, when suddenly my headphones were knocked off my head and a man threw his arm around my neck, saying "Just be quiet." I was being attacked, and this man's arm was gripping onto me! I started screaming and tried to pull him off me, but failed. He was forcing me to walk towards the back of an auto repair shop and he just kept saying: "Be quiet." My mind froze with fear. Then I heard my great-grandmother's voice in my head. She was saying: "Come on now, I know you are stronger than that!" She was the rock in our family until she died four years ago. I have never had any self-defense training, but I went for it--I let out a loud scream as I kicked my leg back into his shin ! He let go of me and I ran off. When I looked back to see if he was running after me, I saw he was running in the opposite direction. Then I ran like crazy to a nearby drugstore. I asked the girl at the counter for the phone and called my mom. She picked me up five minutes later and I explained what happened through sobs. "I am calling the police!" She exclaimed. When we got home, two officers were waiting for us and I told them what had happened. After my experience, I was afraid to do anything. Things slowly got better, but I still don't like anyone going near my neck. The fear isn't totally gone--after all, the guy is still out there somewhere. But I had a new understanding of my own strength. I never expected to be able to fight off an attacker. I am stronger than I realized. How did the author get rid of the man? A) Her great-grandmother came and helped. B) She used all her strength to pull him off her. C) Her loud scream scared the attacker and people came to help. D) Her great-grandmother's words gave her the strength to defend herself.
(Answer)
D
Ques: An increasing number of people are being allowed to finish the working week early during the summer months. Does your boss trust you to spend an afternoon in the sun? Each year the number of companies which offer employees the choice of an early finish to the working week grows. Or, perhaps, each year,more people who work on ordinary Fridays hear about people playing on summer Fridays. When the sun is shining,it makes sense that you should be given Friday afternoons off,right? Sadly,not all managers agree with the policy. Companies that offer employees Friday afternoons off usually expect the hours to be made up. UK publishers Pan Macmillan and Penguin Random House (PRH) are among those offering summer hours. At PRH, those who wish to take off Friday afternoons are expected to work an extra 45 minutes a day from Monday to Thursday. On Fridays, a rota ensures each team has been covered. "Most of us don't leave at exactly lpm,"Editor Anderson says. Depending on your workload,you might just leave an hour or so early,but it's still nice to do. " Simon Hayward, CEO of Cirrus, says that the "Summer Fridays" policy requires trust, and that managers need to be seen to take advantage of the offer too. "If a manager offers summer Fridays and then obviously expects employees to work on Friday afternoons, there is a risk associated with it that reduces the sense of well-being .I think there's a genuine fear in some organizations about flexible working hours. Do you trust your employees to do their best for the buti- ness as well as for themselves and their families,or do you fundamentally mistrust them?" Managers in the former camp tend to be comfortable with summer hours. Those in the latter worry that summer Fridays will lead to late Mondays and long-lunch Tuesdays. Usually in companies, this policy causes the employees to_. A) work extra time from Monday to Thursday B) actually work on Friday afternoons C) have a short lunch on Tuesdays D) start work early on Friday mornings
Ans: A
Ideas about education are changing in the United States. Education today is not just a high school diploma or a college degree. Many adults are not interested in going to college. They are interested in other kinds of learning. For them, learning does not end with a diploma. Continuing education gives these adults the chance to increase their knowledge. It also gives them a chance to improve their old skills or to learn new ones. If they know more or learn more, then they can get a better job or earn more money. There are usually a large number of classes to choose from. Some adults learn new skills. Some take classes for fun or because the class will be useful for them. Others take classes to improve their own lives because they want to feel better about themselves. And still others learn how to be good parents, or how to get along with other people. There are many chances for adults to continue their learning. Almost any community college or public school system has a continuing education program. There are classes in schools, buildings, or churches. Most classes are in the evening, so working people can attend. The classes are usually small, and they are inexpensive. Thousands of people take continuing education classes each year. They receive no diploma and no grade for most of the classes they attend. For them, learning is something they do because they want to. Attending continuing education classes _ . A) does not cost much money B) is expensive C) requires a lot D) is free of charge
A