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研究在不同环境下分别养大的同卵双胞胎的研究者发现，每一对这种双胞胎在性格上、医疗记录和生活经历上都相似。这些研究者认为这些结果证实了这种假设：遗传在决定人的性格和生活经历时比环境起更大的作用。 以下哪项，如果为真，将最严重地削弱上述假设
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根据最近一项跨文化的研究，已婚人口通常比离婚且没有再婚的人寿命长。这一事实表明与离婚相关的压力对健康有不利影响。 下面哪个，如果正确，指出了以上论述的一处缺陷
Our children are disconnecting with nature. The average suburban young person has little relationship to increasingly distant wild places. By the time they are seven years old, most youngsters have been exposed to more than 20,000 advertisements. They can identify 200 corporate logos (社团理念), but they cannot identify the trees growing in their front yards. They can navigate the Web with ease, but few of them have climbed a tree and even fewer have the love of nature needed to be good stewards (庄园的管理者). How can they be good stewards if they don’’t care about trees, wildlife or wild places Trees always inspired me as a child, so when my seventh-grade science teacher asked each student to do a project, my choice was an easy one. I set out to make a leaf collection of every native tree in the Pittsburgh area. I spent countless hours hiking forests, identifying trees, pressing leaves. In the process, I developed a deeper appreciation of the richness of our forests. In many ways, that leaf collection helped launch my career in conservation (蓄林). Trees are amazing. They give meaning to the notion of "multitasking." Their shade cools us during summer. In winter, their tossing branches buffer harsh winds. They bear tasty fruits and nuts, often in extravagant abundance. They provide us with wood and paper products. All the while, trees produce oxygen, sequester (没收、吸收) carbon dioxide and help reduce global warming. They build soil and reduce water runoff and pollution. Trees even make us well when we are sick. Aspirin is derived from willows. The breast cancer-fighting compound Taxol is extracted from western yews (紫杉). Chemicals from pinko trees are widely used as memory enhancers. Though often overlooked, trees are an essential element of local beauty. They quietly define place. Imagine giant redwoods reaching skyward in a northern California coastal forest, mature ponderosary (笨重的) pines in the Rockies, stately live oaks draped with Spanish moss on a Southern plantation, massive white oaks with widely outspread branches on Midwestern farms, multicolored autumn landscapes of mixed forests in New England. What would these places be like without their unique trees In recent times, we have been taking down trees by the millions and replacing them with highways and shopping malls. Along with the loss of trees, we lose the understory (林下叶层) of native wild plants and the wildlife that they shelter. I wish every conservation-minded adult would take a moment to introduce just one child to just one tree. It’’s a small step but who knows what little actions like this can do to stimulate childhood curiosity How can we expect our children to care if you and I don’’t help them make the critical connections to nature while they are young enough to have their values shaped If you need help with tree identification, visit our resource library at enature.com. Trees give us so much and they desperately need our attention—and the attention of our children. If you want to do something for nature this season, plant a tree and while you are at it, plant a seed in the heart of a future steward. The author did many things except________ in his childhood.
患者，女，60岁，风湿性心脏病史，阵发性夜间呼吸困难3d。查体：BP 130/100mmHg，HR 126/min，心界左下扩大，心尖部Ⅳ级收缩期杂音，两肺散在干鸣，下肢无水肿，心电图示阵发性室上性心动过速。 该患者经治疗病情平稳后一直服用地高辛，某天发生腹泻后出现心动过缓，HR48/min，二度房宣传导阻滞，应该
74．Fortunately, _______________________________(她是这次飞机失事中惟一的幸存者)．
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