Read the following article and select the best answer. Article: A green house is a building made of glass which is used for keeping warm when the outside temperature is low. In a similar way there are several gases in the atmosphere (mixture of gases that surround the earth) which trap the heat produced by the sun and prevent it from escaping. These gases are known as "greenhouse gases". And the way in which they trap heat in the atmosphere is called the "greenhouse effect". This is not simply air pollution. Most of the main greenhouse gases exist naturally in small amounts in our atmosphere, and without them the earth would be 30 degrees colder and human life would not exist. In other words, the greenhouse effect is a natural course which is to some degree helpful to us. The problem is that in the last century and a half, we have been putting too many of these gases into the earth's atmosphere by burning large quantities of coal and oil and by cutting down forest. The rapid increase in greenhouse gases is making the world warmer. The world's temperature has already gone up by half a degree this century, and the sea level has risen by 10 centimetres. If the amount of carbon dioxide in the atmosphere doubles, there will probably be a rise in the earth's temperature of between I and 4degC;. This may seem a small increase, but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded, and some areas would become dry and unable to produce crops. It is important, too, to consider that there may be a delay of about 30 years in the greenhouse effect. This means that we are probably experiencing only now the effect of the gases put into the atmosphere before the 1960s. Since then, our use of these gases has greatly increased. Question: Which of the following is not true? - Burning too much coal and oil produces lots of greenhouse gases. - It has become warm on the earth now than in the past. - Gases put into the atmosphere now will affect the earth years later. - The temperature in a greenhouse is as high as that in the atmosphere.
The temperature in a greenhouse is as high as that in the atmosphere.

Read the following article and select the best answer. Article: In a recent class I was asked "What is a short story?" My first answer was that it was something that could be read in one sitting and brought an illumination to the reader, sudden and golden like sunlight cracking(, ) through a heavy cloud. I went on to say that in my opinion a "real" short story was closer to poetry than to a novel. Here are some definitions of the short story. My favorite is Benet's: "something that can be read in an hour and remembered for a lifetime". One writer said, "The theme of a novel won't fit into the framework of a short story; It's like trying to squeeze a large painting done on a wall into the frame of a miniature . And as in a miniature painting, the details need to be sharp. " The short story is an example of one aspect of human nature. Often a character _ some event, something that offers him or her change. This is why it's said that short stories usually "say something ", often a small something, but sometimes delivered with such accuracy that the effect is strongly felt, even a life-moment for some readers, something similar to a religious experience or to witnessing a never-to-be-repeated scene in nature. Ok, let's form a definition here: A short story is an account, rarely over 10, 000 words or below 500 words-more commonly 1, 500 to 5, 000 words-a single-sitting read, but with enough time and weight to move the reader. It is narrow and focused to produce an effect through the story, most commonly through events affecting some change in an individual. Writer Isabelle Allende once wrote: "Novels are, for me, adding up details, just work, work, work, then you're done. Short stories are more difficult-they have to be perfect, complete in themselves. " Question: What's the difference between novels and short stories? - Novels are too long for us to read. - Short stories are too short for us to read. - Short stories have more details than novels. - Short stories are more perfect and difficult than novels.
Short stories are more perfect and difficult than novels.

Read the following article and select the best answer. Article: Air traffic controllers in the US have been advised to take 26-minute naps , after a series of accidents involving workers falling asleep. Now the National Transportation Safety Board (NTSB) is calling for "controlled naps" during nightshifts . NTSB member Mark Rosekind said that a 26-minute nap would improve performance by 34%. He believes that beyond the aviation industry, other professions, such as motoring and machinery, also carry obvious risks. But other experts doubt whether 26 minutes is the appropriate napping time. It's a bit too long and risks you falling into a deep sleep, says Jim Horne, director of the Sleep Research Council. He said, "A nap of about 15 minutes is best; once you get beyond 20 minutes, you risk a deep sleep and you can be much more tired when you wake up. Therefore, we suggest that a nap be combined with a cup of coffee so that you can enjoy an effective sleep before the caffeine takes effect in 20 minutes. However, this method only works on those who have had a poor night's sleep. If you haven't had a sleep the night before, this method won't be enough to make you fresh." Health writer, Linda Wasmer Andrews, also believes that 26 minutes is too long. She says a nap between 10 and 20 minutes is enough, and the timing of the nap is also important. Putting your head down too early means your body may not be ready to sleep yet, but a nap that is too late in a day might make it harder to fall asleep. Early afternoon is often the best time, between l pm to 3pm, when people experience a post-lunch decrease in energy. Question: Jim Horne thinks that a 26-minute nap is not appropriate because _ . - people risk a deep sleep and may feel more tired - the guidelines for drivers can reduce the napping time - people who had a poor sleep need some more napping time - it's a little long for people who didn't sleep the night before
people risk a deep sleep and may feel more tired