Read the following article and select the best answer. Article: DNA is one of the most important discoveries in science. DNA is the plan for the human being, as a blueprint is the plan for a building. DNA makes a person look the way he does. A person's DNA comes from a mixing of his parents' DNA. That's why a child looks like his parents. But, besides controlling things such as height and hair color, DNA can also give people diseases. Scientists are now studying DNA to cure diseases. In the seventies, scientists developed a process called recombinant or RDNA. Although it sounds difficult to understand, RDNA simply means taking DNA from one animal or plant and putting it into another. By doing so, scientists can create new beings. In doing so, scientists can better understand DNA, especially what parts of DNA do what. After they understand DNA, scientists can begin to cure diseases. Often, the new being created will itself be the cure. Besides curing diseases, RDNA research can also do other things. For example, scientists in Japan have already created "super-trees". Trees help humans, because they take CO2, which poisons humans, from the air and turns it into oxygen, which lets humans breathe. "Super-trees" do this too, but do it much faster. As things such as cars and factories have already put much CO2in the area, "super-trees" are badly needed. Unfortunately, there is a serious danger in RDNA research. Scientists want to create animals to cure old diseases, but these new animals may also create new diseases. It will be a serious problem if the animals escape from the science laboratory and into nature. As these animals are not natural, they may _ many new powerful diseases. As a result, RDNA research will create many solutions, but it will also create many problems. Question: From the passage, we can know that a boy looks like his parents because _ . - he is son of his parents. - his parents' DNA decides his appearance. - he has received DNA from his father or his mother. - scientists have put some of his parents' DNA into him.
his parents' DNA decides his appearance.

Read the following article and select the best answer. Article: Teaching is more than leadership. Some of the teacher's time and effort is directed toward instruction, some toward evaluation. But it is the teacher as a group leader who creates an effective organizational structure and good working environment so that instruction and evaluation activities can take place. A group that is totally disorganized, unclear about its goals, or constantly fighting among its members will not be a good learning group. The leadership pattern includes helping to form and _ a positive learning environment so that instruction and evaluation activities can take place. On the first day of class, the teacher faces a room filled with individuals. Perhaps a few closely united groups and friendships already exist. But there is no sense of group unity, no set of rules for conduct in the group, no feeling of belonging. If teachers are successful leaders, they will help students develop a system of relationships that encourages working together. Standards and rules must be set to keep order, make sure of justice and protect individual rights, but do not contradict school policy. What happens when one student hurts another's individual rights? Without clear regulations agreeable to the students and teachers, the classroom can become chaotic. Students may break rules they did not know existed. If standards are set without participation from the class, students may spend a great deal of creative energy in destroying the class environment or finding ways to break rules. No matter how skillful the teacher is in uniting students and creating a positive atmosphere, the task is never complete. Regular maintenance is necessary. Conflicts arise. The needs of individual members change. A new kind of learning task requires a new organizational structure. Sometimes outside pressures such as holidays, upcoming tests or sport competitions, or family troubles cause stress in the classroom. One task for the teacher is to recreate a positive environment by helping students deal with conflict, change, and stress. Question: According to the author, the teacher should _ . - free students from outside pressures - set the standards and rules on his own - be responsible for a well-organized class - focus more on instruction and evaluation
be responsible for a well-organized class

Q: Read the following article and select the best answer. Article: Exercise is one of the few factors with a positive role in long-term control of body weight. Unfortunately, that message has not gotten through to the average American, who would rather try switching to "light" beer and low-calorie bread than increase physical efforts. The Centers for Disease Control, for example, found that fewer than one-fourth of overweight adults who were trying to lose weight said they were combining exercise with their diet. In rejecting exercise, some people may be discouraged too much by caloric-expenditure charts; for example, one would have to quickly walk hard three miles just to work off the 275 calories in one delicious Danish pastry . Even exercise professionals accept half a point here. "Exercise by itself is a very tough way to lose weight," says York Onnen, program director of the President's Council on Physical Fitness and Sports. Still, exercise's supporting role in weight reduction is vital. A study at the Boston University Medical Center of overweight police officers and other public employees confirmed that those who dieted without exercise regained almost all their old weight, while those who worked exercise into their daily routine maintained their new weight. If you have been sedentary and decide to start walking one mile a day, the added exercise could burn an extra 100 calories daily. In a year's time, assuming no increase in food intake, you could lose ten pounds. By increasing the distance of your walks gradually and making other dietary adjustments, you may lose even more weight. Question: "Even exercise professionals accept half a point here" means "They _ ". - agree that the calories in a small piece of pastry can be easy to work off by exercise - partially believe diet plays a supporting role in weight reduction - are not fully convinced that dieting can help maintain one's new weight - are not sufficiently informed of the positive role of exercise in losing weight
A: partially believe diet plays a supporting role in weight reduction

(Q).
Read the following article and select the best answer. Article: Whether you live in Seattle or the Sahara desert, the time has come to invest in a good raincoat or umbrella, a new study suggests. As global temperatures continue to rise, more "extreme rain" events--intense, cats-and-dogs downpours--can be expected, said thestudy, published Monday in the journalNature Climate Change. And that, scientists said, means an increased flood risk, particularly for the world's driest areas. The study challenges the idea that global warming is causingdry areas to become drierand wet areas wetter. "In both wet and dry regions, we see these great increases in heavy precipitation ," lead author Markus Donat, a climate scientist at the University of New South Wales, told Nature. Donat and his team collected data from 1951 to 2010 on extreme precipitation events from 11, 000 weather stations around the world, Nature reported. In that time, the number of days with "extreme precipitation" increased 1 percent to 2 percent per decade. "We found a strong relationship between global warming and an increase in rainfall, particularly in areas outside of the tropics," Donatsaid in a statement. "Importantly, this research suggests we will see these extreme rainfall events increases at regional levels in dry areas, not just as an average across the globe," Donat added. Peter Stott, a senior climate scientist at Met Office, told Climate Central that the study's findings are important, because more violent rainfall and flooding will "challenge our capability to adaptto a rapidly changing climate." As Nature reported, the research aligns witha 2015 study that found global warming has led to a sharp increase in record-breaking precipitation events. Donat told Nature that his study should come as a warning to world governments. Question: The purpose of the study is to _ . - encourage investors to start business in Seattle or the Sahara desert - persuade people to take a raincoat or an umbrella with them - challenge the previous findings of research on climate - warn world governments to focus on global warming
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warn world governments to focus on global warming