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Article: American cities are similar to other cities around the world.In every country, cities reflect the values of the culture.American cities are changing,just as American society is changing. After World War II,the population of most large American cities decreased;however, the population in many Sun Belt cities increased.In the late 1940s and early 1950s,city residents became wealthier.They had more children so they needed more space.They moved out of their apartments in the city to buy their own homes.They bought houses in the suburbs . Now things are changing,the children of the people who left the cities in the 1950s are now adults.Many, unlike their parents,want to live in the cities.They continue to move to Sun Belt cities and older ones of the Northeast and Midwest.Many young professionals are moving back into the city.They prefer the city to the suburbs because their jobs are there;or they just enjoy the excitement and possibilities that the city offers. This population shift is bringing problems as well as benefits.Countless poor people must leave their apartments in the city because the owners want to sell the buildings or make apartments for sale instead of for rent.In the 1950s,many poor people did not have enough money to move to the suburbs;now many of these same people do not have enough money to stay in the cities. Only a few years ago,people thought that the older American cities were dying.Some city residents now see a bright,new future.Others see only problems and conflicts.One thing is sure:many dying cities in America are alive again. Question: What does the author think of cities all over the world? Yes or no, is the answer "They are similar."?
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Yes

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Article: There are two kinds of changeschemical change and physical change. In a chemical change, there is always a new substance formed. Breaking up water into hydrogen and oxygen is a chemical change. In each of the chemical change at least one new substance is formed. A change is not a chemical change if it doesn't form a new substance. Physical changes are very common, too. There are many examples. You can make a physical change by tearing a piece of paper into two, or by cutting a piece of iron with lathe . Here paper is still paper, and the iron is still iron. Another way of making physical change is dissolving something in water. When you dissolve salt in water, the salt disappears. You may think that a new substance has been formed. But really there is no new substance. The salt is still salt. You can still taste it. So the dissolving of anything is a physical change. When water freezes, the change is also a physical one. The water changes from liquid to solid, but it is still the same substance. That is why the freezing of anything is a physical change. Question: We can separate a chemical change from a physical one by _ . Yes or no, is the answer "newly-formed substances"?
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Yes

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Article: Step into an American preschool classroom today and you are likely to fall into a so-called print-rich environment,every surface colorfully decorated with instructional posters,classroom rules,chedules,and mottos,few of which a 4-year-old can understand in fact. Besides the confusing things on classroom walls,teaching methods and curriculums have changed recently,by which more time is spent on what's called "seat work"workbooks and worksheets--but less time devoted to music and art.School--readiness skills are essential for the youngest learners to move on to a subsequent stage. As a result, expectations that may arguably have been reasonable for 5-and 6-year-olds, such as bemg able to sit at a desk and using pencil and paper,are now directed at even younger children, who lack the motor skills and attention span to be successful. However,parents of preschoolers tend to _ these changes,because they fear that the old--fashioned pleasures of unhurried learning have no place in today's highly competitive world.The stress is obvious:Pick the "wrong" preschool and your child might not go to college.She might not be employable. She might not even be allowed to start first grade! As preschoolers are learning so much academic knowledge at earlier ages,they seem somehow less curious and less engaged.Some teachers say that more children today seem to lack the language skills.The real focus in the preschool years should not be just on vocabularv and reading,but on talking and listening.By talking with adults, and one another,they pick up information,learn how things work and solve puzzles that trouble them.For our littlest learners,what could be more important than that? Question: Why are parents so picky when choosing a preschool for their kids? Yes or no, is the answer "Because a wrong preschool might ruin kids' future."?
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No