Read the following article and select the best answer. Article: The concept of solar power satellites, or SPS, first put forward in the 1960s, is still not widely known by the general public. For example, at many public exhibitions about energy, SPS is not even mentioned. This is mainly because very little money has been spent on SPS research There are people who claim that SPS is unrealistic - because launch costs are much too high today; or because it is too far away. So why do we believe that it is important to continue to do researches on SPS? The reason is very simple. Humans are going to need huge amounts of electric power in coming decades. Within 50 years the world population is expected to double, while economic growth will continue around the world, especially in the poorer countries. But existing energy sources already face serious problems. They are limited; they are polluted; they are dangerous. So 50 or 100 years from now, where is our power going to come from? Nobody knows. And so we believe that new large-scale possibilities should be studied further. We must remember that humans have some choices concerning our future. To some extent we can choose the direction in which our civilization develops. And choices that are made in the coming decades - such as the energy sources that we will or will not use, will have major, long-term meaning for human life on earth. We believe that if research continues to show that SPS is environmentally and economically attractive, SPS will open the door to a much more attractive future for human civilization than any ground-based energy source, and one that the public will support and that young people will find challenging and exciting. Furthermore energy from SPS can be readily used in developing countries, as the SPS 2000 project will show, thus aiding economic development worldwide. In addition, by creating large commercial fund for space engineering, SPS will open the frontier of space to economic development, thus creating a limitless new field for the growth of the world economy. Question: The writer's attitude towards the research can best be summarized by the saying " _ ". - In time of peace prepare for war - Put the cart before the horse - One man's meat is another man's poison - Easier said than done
In time of peace prepare for war

Read the following article and select the best answer. Article: -American office workers spend an average of 52 hours a week at their desks, according to a statistic survey. Some might argue that not all that time is spent working,but still all those hours in windowless offices with artificial light can have an influence. A few green additions could have a large effect on worker happiness,according to the survey led by Tina Cade from Texas State University. "We pretty much found out that if you had windows and plants or even if you just had plants in your office, you were more satisfied with your job," Cade told LiveScience. "We thought it was important for offices because a lot of times people are looking for ways to keep employees happy and do all these expensive things like building a gym. Maybe for less investment they could put in a few plants in important places." The team surveyed 450 office workers in Texas and the Midwest,asking questions about job satisfaction and the work environments. When asked about their overall life quality,82 said they felt "content" or "very happy". Only 69 percent of those who work with plants but without windows,and 60 percent of those who have windows but no plants, said they felt this way. The group of people who work without plants or windows were the most dissatisfied,with only 58 percent of them saying that overall they were "content" or "very happy". While no one who works with plants,windows,or both reported they felt "miserable", 0.8 percent of those who work in offices without either said they were "miserable". "I was really surprised that having a plant in your office appeared to be more beneficial than having a window in your office," Cade said. "Everybody says, 'I need a window!' but actually it seemed like a plant could be a suitable alternative." Question: What does the passage mainly tell us? - Green plants can increase job satisfaction. - An easier way to increase job satisfaction. - What the best working environment is. - Who are happy with their job environment.
Green plants can increase job satisfaction.

Q: Read the following article and select the best answer. Article: The word "conservation" has a thrifty meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such a good condition that others may also share the enjoyment. Our forefathers had no idea that human population would increase faster than the supplies of raw materials: most of them, even until very recently, had the foolish idea that the treasures were "limitless" and could "last forever". Most of the citizens of earlier generations knew little or nothing about the complicated and delicate system that runs all through nature, and which means that, as in a living body, an unhealthy condition of one part will sooner or later be harmful to all the others. Fifty years ago, nature study was not part of school work; scientific forestry was a new idea; wood was still cheap because it could be brought in any quantity from distant woodlands; soil destruction and river floods were not national problems; nobody had yet studied long-term climatic cycles in relation to proper land use; even the word "conservation" had nothing of the meaning that it has for us today. For the sake of ourselves and those who will come after us, we must now set about correcting the mistakes of our forefathers. Conservation should be made part of everybody's daily life. To know about the water table in ground is just as important to us as a knowledge of the basic math formulas . We need to know why all watersheds need the protection of plant life and why the running current of streams and rivers must be made to give their full benefit to the soil before they finally escape to the sea. We need to be taught the duty of planting trees as well as of cutting them. We need to know the importance of big, grown trees, because _ In a word, it should be our goal to restore as much of the original beauty of nature as we can. Question: According to the author, the greatest mistake of our forefathers was that _ . - they had no idea about scientific forestry - they had little or no sense of environmental protection - they were not aware of the importance of nature study - they had no idea of how to make good use of raw materials
A: they had little or no sense of environmental protection

(Q).
Read the following article and select the best answer. Article: On the night of July 6, 1943, a plane took off from an Air Force base in England to stop German fighters over the English Channel. Piloting the plane was Captain Thomas Nash. Looking westward, Nash saw twelve orange lights in a row, moving at a very high rate of speed. Thinking they might be a new German weapon, he swung the plane around and headed directly for the lights, but they disappeared. Captain Nash may have been the first to see such orange lights but he wasn't the last. His experience was repeated many times by pilots during World War II both in England and Far East. What were they? No one knows for sure, but there is an interesting theory to explain them. According to this theory, the orange lights are space animals---animals specially adapted to life in the upper atmosphere just as some living things are adapted to life at the bottom of the sea. These space animals, the theory says, live so far up in the atmosphere that they are not in sight from the earth. They feed partly on the air and partly on energy from the sunlight. Being almost pure energy themselves, their body shine at night. During the day, however, they are invisible. Before World War II, continues the theory, there was little radiated energy on the earth's surface. Then came the development of rockets, nuclear power stations and something like that. The space animals are attracted to these kinds of energy of food. At night when there is no energy from the sunlight, they come down into the lower levels in search of a meal. They may even float into the range of human eyesight. This explains the fact that they have been sighted many times from the earth since 1943. Question: The theory says that during the daytime the space animals _ . - shine brightly in the sky - cannot be seen - are in sight now and then - visit the earth's surface
(A).
cannot be seen