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某工程单代号搭接网络计划如下图所示，节点中下方数字为该工作的持续时间，其中的关键工作为()。
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A new study found that inner-city kids living in neighborhoods with more green space gained about 13% less weight over a two-year period than kids living amid more concrete and fewer trees. Such 【C1】______ tell a powerful story. The obesity epidemic began in the 1980s, and many people 【C2】______ it to increased portion sizes and inactivity, but that can't be everything. Fast foods and TVs have been 【C3】______ us for a long time. "Most experts agree that the changes were 【C4】______ to something in the environment," says social epidemiologist Thomas Glass of the Johns Hopkins Bloomberg School of Public Health. That something could be a 【C5】______ of the green.
The new research, 【C6】______ in the American Journal of Preventive Medicine, isn't the first to associate greenery with better health, but it does get us closer 【C7】______ identifying what works and why. At its most straightforward, a green neighborhood 【C8】_____ means more places for kids to play—which is 【C9】______ since time spent outdoors is one of the strongest correlates of children's activity levels. But green space is good for the mind 【C10】______ ;research by environmental psychologists has shown that it has cognitive 【C11】______ for children with attention-deficit disorder. In one study, just reading 【C12】______ in a green setting improved kids' symptoms.
【C13】______ to grassy areas has also been linked to 【C14】______ stress and a lower body mass index (体重指数) among adults. And an 【C15】______ of 3,000 Tokyo residents associated walkable green spaces with greater longevity (长寿) among senior citizens.
Glass cautions that most studies don't 【C16】______ prove a causal link between greenness and health, but they're nonetheless helping spur action. In September the U. S. House of Representatives 【C17】______ the delightfully named No Child Left Inside Act to encourage public initiatives aimed at exposing kids to the outdoors.
Finding green space is not 【C18】______ easy, and you may have to work a bit to get your family a little grass and trees. If you live in a suburb or a city with good parks, take 【C19】______ of what's there. Your children in particular will love it—and their bodies and minds will be 【20】______ to you.
【C1】
听力原文：M: Our basketball team is playing in the finals but I don't have a ticket. I guess I'll just watch it on TV. Do you want to come over？
W: Actually I have a ticket. But I'm not feeling well. You can have it for what it cost me.
Q: What do we learn from the conversation？
(18)
During the 1980s, unemployment(失业人数) and underemployment(不充分就业) in some countries was so high as 90 percent. Some countries did not【B1】enough food; basic needs in housing and clothing were not【B2】. Many of these countries looked【B3】the industrial processes of the developed nations for solution.
【B4】, problems cannot always be solved by【B5】the industrialized nations. Industry in the developed nations is highly automated and very【B6】. It provides fewer jobs than labor-intensive industrial【B7】, and highly skilled workers are needed to【B8】and repair the equipment. These workers must be trained,【B9】many nations do not have the necessary training institutions. Thus, the【B10】of importing industry becomes higher. Students must be sent abroad to receive vocational and【B11】training.【B12】, just to begin training, the students must【B13】learn English, French, Germans, or Japanese. The students then spend many years abroad, and【B14】do not return home.
All nations agree that science and technology should be shared. The point is: countries【B15】the industrial processes of the developed nations need to look carefully【B16】the costs, be cause many of these costs are【B17】. Students from these nations should【B18】the problems of the industrialized countries closely.【B19】care, they will take home not the problems of science and technology,【B20】the benefits.
【B1】
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
Teachers always plan down to the minute what their students will be doing. This is good for kids, because it teaches them to stay on task and follow a schedule. But most homes aren't run this way. If parents do plan their children's lives minute by minute, what happens when that child grows up and goes to college？ At some point, kids need to learn to manage their own time. This can be one of the valuable skills you help your kids develop outside of school. But it generally won't happen all by itself, because there's a big transition that happens when kids leave the structured school environment and come home.
If you have kid stay alone at home, think hard about trying to find an adult who can be there and provide the support your child needs. If a supportive adult isn't available, an expert named Martin recommends you find an after-school program led by experienced professionals who will engage them in creative activities, nourish them with healthy snacks, and assist them with their schoolwork.
If you are at home on the contrary, to take some break after the guys get started on diversions, because it's hard to stop and do something like homework. "If that little bit of downtime is television, good luck...getting them to do their homework." says a professor of child development at California State University, "TV is addictive." A better way to help your child unwind is with a healthy snack. "Wait until dinner, make a plate full of energizing food. You could even dish up part of the dinner you're preparing a little early for the kids," she says.
While you're sharing a snack, you can make a list of what your kids will get to do during their study breaks. The types of breaks recommended include shooting baskets, getting a drink, using the bathroom, or even playing a quick card game with parents. Your kids can be the ones to decide which breaks they'd like to take. But, as Freimuth says, your children will have to be honest about what kind of break will energize them and not upset their momentum.
The main purpose of this passage is _____.
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