题目内容
Malls are popular places for Americans to go. Some people spend so much time at malls that they are called "mall rats". Mall rats shop until they drop in the hundreds of stores under one rood.People like malls for many reasons. They feel safe because malls have police stations of private security guards. Parking is usually free, and the weather inside is always fine. The newest malls have beautiful rest areas with waterfalls and large green trees.The largest mall in the United States is the Mall of America in Minnesota. It covers 4.2 mil- lion square feet. It has 350 stores, eight night clubs, and a seven-acre park! There are park- ing spaces for 2,750 cars. About 750,000 people shop there every week.The first indoor mall in the United States was built in 1965 in Edina, Minnesota. People like doing all their shopping in one place. More malls were built around the country. Now, malls are like town centers where people come to do many things, they shop, of course, they also eat in food courts that have food from all over the world. They see movies at theatres. Some people even get their daily exercise by doing the new sport of "mall walking". Others go to malls to meet friends.In some malls, people can see a doctor or a dentist and even attend church. In other words, people can do just about everything in malls. Now residents can actually live in their favorite shopping center. How many cars can be parked in the Mail of America().
查看答案
搜索结果不匹配？点我反馈
更多问题
Outline：Your essay should be based on the information given below． ①乘飞机旅行有许多长处(方便、快捷、省时、舒适等)。 ②空中旅行也有许多不足之处(机票价格贵，有的旅客不适应空中旅行，常常感到身体不适，甚至有人还担心发生空难)。请你简单阐述上述两个方面。 ③最后请你说明你的看法。
Poor as he was, he cared little about money reward.
Yesterday they received a written (invite) _________ to a dinner from Mr.Black.
Black holes. They act like huge drains in the universe. Frightening Fascinating Or just fantasy The very concept of black holes confuses our common sense notions of matter, time, and space. The theory that black holes can, and probably do, exist in space doesn’ t only concern scientists and astronomers.(61)For if the theory is valid, we must question all our basic physical laws and, indeed, our "normal" experience of the physical world around us.What is a black hole Well, it’s difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. (62)Astronomers and scientists think that a black hole is a region of space (not a thing) into which matter has fallen and from which nothing can escape--not even light. So we can’ t see a black hole. A black hole exerts a strong gravitational pull and yet it has no matter. It is only space---or so we think. How can this happenThe theory is that some stars explode when their density increases to a particular point; they "collapse" and sometimes a supernova occurs. The collapse of a star may produce a "White Dwarf" or a "neutron star’--a star whose matter is so dense that it continually shrinks by the force of its own gravity. But if the star is very large (much bigger than our sun) this process of shrinking may be so intense that a black hole results. (63)Imagine the earth reduced to the size of a marble, but still having the same mass and a stronger gravitational pull, and you have some idea of the force of a black hole. Any matter near the black hole is sucked in. It is impossible to say what happens inside a black hole.Our space and time laws don’ t seem to apply to objects in the area of a black hole. Einstein’ s relativity theory is the only one that can explain such phenomena. Einstein claimed that matter and energy are interchangeable, so that there is no "absolute" time and space. There are no constants at all, and measurements of time and space depend on the position of the observer --they are relative. (64)We do not yet fully understand the implications of relativity theory; but it is interesting that Einstein’ s theory provided a basis for their existence. It is only recently that astronomers have begun specific research into black holes.The most convincing evidence of black holes comes from research into binary star systems. In some binary systems, astronomers have shown that there is an invisible companion star, a "partner" to the one which we can see in the sky. There is one star, called by its catalogue number HDE 226868,which must have a partner. This partner star, it seems, has a mass ten or twenty times greater than the sun--yet we can’t see it. Matter from HDE 226868 is being dragged towards this companion star. Could this invisible star, which exerts such a great force, be a black hole Astronomers have evidence of a few other stars too, which might have black holes as companions.The story of black holes is just beginning. Speculations about them are endless. There might be a massive black hole at the center of our galaxy swallowing up stars at a very rapid rate. Mankind may one day meet this fate. On the other hand, scientists have suggested that very advanced technology could one day harness the energy of black holes for man’ s use on earth. There are also suggestions that black holes could be used to create bombs in the future, by amplifying radio waves sent up to them. These speculations sound like science fiction. But the theory of black holes in space is accepted by many serious scientists and astronomers. (65)They show us a world that operates in a totally different way from our own and they question our most basic experience of space and time. They show us a world that operates in a totally different way from our own and they question our most basic experience of space and time.
微信支付 
支付宝支付