Scientists have long understood the key role that oceans play in regulating the Earth's climate. Oceans cover 70 percent of the globe and store a thousand times more heat than the atmosphere does. What's newer is the understanding of how this key component of our climate system responds to global warming. A brake on global warming -- for now One of oceans'most important climate functions is absorbing heat and carbon dioxide (CO2), one of the gases that cause global warming. Acting as a heat sponge , oceans have absorbed huge amounts of heat and CO2in the last forty years. Fujita explains that "oceans are saving us from faster climate change -- they are a big flywheel that delays rapid overheating of the Earth, putting a brake on the climate system." "That's the good news," he adds. "The bad news is that oceans only slow the atmospheric warming. Once oceans come to balance with a greenhouse gas warmed earth, the extreme heat will remain in the atmosphere and things will get much hotter." But where and how oceans release this accumulated heat is uncertain. And as oceans store heat, fragile underwater ecosystems are struggling. The most recent scientific report from the Intergovernmental Panel on Climate Change (IPCC) also notes with concern that oceans are acidifying because of increased absorption of atmospheric CO2, and thus causing a threat for shell-forming species. Sharp increases in carbon dioxide levels will cause further acidification of oceans. Currents distributing heat Another important role oceans play is that of distributor. Oceans deliver heat and life-sustaining nutrients around the globe. Just as blood vessels bring oxygen and nutrients to cells in the human body, oceans' currents carry oxygen, nutrients and heat throughout the Earth. Oceans distribute 25 percent to 50 percent of the energy the planet receives from the sun. For example, the Gulf Stream carries heat across the Atlantic. This warm current gives northwestern Europe a milder climate than it would normally have so far north. A... From the passage we can learn that oceans' currents _ . A) produce oxygen and nutrients everywhere B) absorb 25% to 50% of the energy from the sun C) distribute heat and nutrients around the globe D) change oceans' circulation patterns
C
One should be moderate ( ) in all things. Moderation is always the safest way to do things, and a virtue we should have. Let's take the student life for example. There are some students who study too hard and play too little, while there are others who play too much and study too little. On the one hand, it is harmful to his health if he has too few physical exercises, and on the other hand, it is harmful to his mind if he plays too much. In the matter of eating, one also should be moderate. Do not eat too much or too little. Too much eating will make you sick, while too little eating will make you weak. The man of progress is he who neither has too high an opinion of himself nor thinks too poorly of himself. If he thinks too highly of himself, he is surely to become very proud, but if he has too poor an opinion of himself, he will have no courage to make an advance. Both the conditions above will make you lose your aim in life. A broadminded man is he who always moves within the orbit of reasonableness . In any activities in one's life, moderation is one of the best ways to enjoy real happiness. If one wants to be broadminded, he must _ . A) be full of courage B) enjoy real happiness C) do everything reasonably D) believe in himself
C
Q: When I heard the piano, I walked to Mrs. Windsor's house and waited outside as I always did. That meant she was working with another student, and I was not supposed to bother them by ringing the bell. I stood against the wall and daydreamed what I'd rather be doing. "Almost anything", I sighed _ . I had been tutored enough to read, understand, and even write some musical compositions, but I just didn't have a gift for it. It didn't come to me naturally. I thought back to happier times when I was writing stories and acting them out with my friends, cutting up old clothes to make dresses that performers wear in plays, and building scenery out of old things we found. But Mrs. Windsor had offered to give me the lessons for free, so I felt my duty to try. The door opened and Wendy Barton came out. I walked in, sat down on the piano bench and began to sort through my sheet music. "Hello," I heard a voice behind me say softly. I turned around to see a little girl standing behind me, eating an apple. But before I could make any response, Mrs. Windsor walked into the room in her usual urgent manner and announced,"Jennifer, this is my niece, Pasha. Pasha, this is Jennifer. Pasha will be giving you your lesson today. I'm up to my ears in something else!" she then exited to the kitchen. Pasha set her apple down on the side table and slid beside me on the piano bench. "What piece do you like best?"she asked. "What do you mean?" I asked. "They're all the same to me. I don't know. "You mean you don't have a favorite?" "No, not really." Pasha looked at me, rather puzzled, then opened my sheet music to the beginning page and asked me to play. I arranged my fingers on the keys and studied the notes on the page for a moment. Then I frowned and concentrated to make the notes on the page match the finger movements. I have to admit I was a rather mechanical pianist. After about a page or two, Pasha gently put her hand on top of mine as if to calm my fingers. There was a long pause. "What are you hearing in the music?" I looked at... 58. Which of the following can best describe Pasha? A) Creative B) Naughty C) Humorous D) Brave
A: A
(Question)
American society is not nap -friendly. In fact, says David Dinges, a sleep specialist at the University of Pennsylvania School of Medicine, "There's even a prohibition against admitting we need sleep". Nobody wants to be caught napping or found asleep at work. To quote a proverb: "Some sleep five hours, nature requires seven, laziness nine and wickedness eleven." Wrong. The way not to fall asleep at work is to take naps when you need them. "We have to totally change our attitude toward napping," says Dr. William Dement of Stanford University, the godfather of sleep research. Last year a national commission led by Dement identified an " _ " which one member said was as important as the national debt. The commission was concerned about the dangers of sleepiness: people causing industrial accidents or falling asleep while driving. This may be why we have a new sleep policy in the White House. According to recent reports, President Clinton is trying to take a ha1f-hour snooze every afternoon. About 60 percent of American adults nap when given the opportunity. We seem to have "a mid afternoon quiet phase," also called "a secondary sleep gate." Sleeping 15 minutes to two hours in the early afternoon can reduce stress and make us refreshed. Clearly, we were born to nap. We Superstars of Snooze don't nap to replace lost shut-eye or to prepare for a night shift.Rather, we "snack" on sleep, whenever, wherever and at whatever time we feel like it. I myself have napped in buses, cars, planes and on boats; on floors and beds; and in libraries, offices and museums. The purpose of this article is to _ . A) warn us of the wickedness of napping B) explain the danger of sleepiness C) discuss the side effects of napping D) convince the reader of the necessity of napping
(Answer)
D