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{{B}}Charter Schools{{/B}} American public education has changed in recent years. One change is that increasing numbers of American parents and teachers are starting independent public schools called charter schools. In 1991, there were{{U}} (51) {{/U}}charter schools in the United States. Today, more than 2,300 charter schools{{U}} (52) {{/U}}in 34 states ar/d the District of Columbia, 2,575,000 students{{U}} (53) {{/U}}these schools. The students are from 5 years{{U}} (54) {{/U}}age through 18 or older. A charter school is created by groups of parents, teachers and community members. It is similar{{U}} (55) {{/U}}some ways to a traditional public school. It receives tax money to operate just as{{U}} (56) {{/U}} public schools do. The amount i A. another B. else C. other D. others [单项选择]《教师资格条例》第六条规定：（）应当包括符合国家规定的从事教育教学工作的身体条件。
A. 承担教育教学工作 B. 具有良好的身体素质 C. 具有良好的心理素质 D. 有教育教学能力 [判断题]LKJ-15型列车运行监控在进站前将“侧线股道 ”输入完毕，进站后运行中无法修改，只允许停车修改。（ ）
A.正确 B.错误 [单项选择]下列规则中哪些不能判别其拉曼或红外光谱是否具有活性( )。
A. 相互排斥规则 B. 相互禁阻原则 C. 相互允许原则 D. 相互不允许原则 [简答题]增值税扣税凭证包括哪些？
[判断题]调节规律是指无人机飞控系统的输入信号与执行结构的输出量之间的函数关系，按调节规律可分为比例式和微分式。( )
A.正确 B.错误 [多选题]由引导人员接车时，引导接车的位置一般为（ ）。
A.引导员接车地点标处 B.进站信号机外方 C.进路信号机外方 D.站界标外方 [单项选择]甲被宣告死亡后，其妻乙改嫁于丙，其后丙死亡。1年后乙确知甲仍然在世，遂向法院申请撤销对甲的死亡宣告。依我国法律，该死亡宣告撤销后，甲与乙原有的婚姻关系如何( )
A. 自行恢复 B. 不得自行恢复 C. 经乙同意后恢复 D. 经甲同意后恢复 [单项选择]转包是指（）。
A. 施工总承包单位将建设工程主体结构的施工分包给其他单位 B. 总承包单位将建设工程分包给不具有相应资质条件的单位 C. 承包单位承包建设工程后，不履行合同约定的责任和义务，将其承包的全部建设工程转给他人 D. 分包单位将其承包的全部建设工程再分包 [多选题]某地公安机关在调查恐怖活动嫌疑时，采取了以下措施，符合法律规定的是( )。
A.对嫌疑人进行检查、传唤 B.提取、采集嫌疑人的肖像、指纹、虹膜图像等人体生物识别信息和血液、尿液、脱落细胞等生物样本 C.通知了解相关情况的人员到公安机关接受询问 D.通知了解相关情况的人员到公安机关接受询问 [单选题]国旗由一名掌旗员掌持，两名护旗员护旗，护旗员位于掌旗员（）
A.A、左侧 B.B、右侧 C.C、一侧 D.D、两侧 [简答题]科学决策的包括哪三个方面？
[单选题]编组始发列车，根据日(班)计划规定的车次，按图定时分正点或早点不超过( )出发时，按出发正点统计。
A.10分钟 B.15分钟 C.20分钟 D.30分钟 [单项选择]需求量总是与价格呈相反方向变化。如果价格变化导致总收入与价格反向变化，那么需求就是有弹性的。在2007年，虽然W大学的学费降低了20%，但是W大学收到的学费总额却比2006年增加了。在这种情况下，对W大学的需求就是有弹性的。
如果以上陈述为真，以下哪项陈述一定真 A. 如果价格的变化导致总收入与价格同向变化，那么需求就是有弹性的。 B. 与2006年相比，学费降低20%会给W大学带来更好的经济效益。 C. 如果需求是有弹性的，那么价格变化会导致总收入与价格同向变化。 D. 与2006年相比，W大学在2007年招生增长的幅度超过了20%。 E. 与2006年相比，W大学在2007年招生增长的幅度低于20%。 [判断题]在竖井内如空气温度高于室外，空气的密度随之出现差别, 由于浮力作用将导致烟囱效应。
A.正确 B.错误 [单选题]根据《建设工程安全生产管理条例》.实行总分包的建设工程发生生产安全事故时 由 事故发生单位负责上报事故。
A.正确 B.错误 [不定项选择题]共用题干
第一篇
Plant Gas Scientists have been studying natural sources of methane（甲烷，沼气）for decades but hadn't regarded plants as a producer, notes Frank Keppler, a geochemist（地球化学家）at the Max Planck Institute for Nuclear Physics in Heldelberg,Germany. Now Keppler and his colleagues find that plants,from grasses to trees,may also be sources of the greenhouse gas.This is really surprising, because most scientists assumed that methane production requires an oxygen-free environment. Previously,researchers had thought that it was impossible for plants to make significant amounts of the gas. They had assumed that microbes（微生物）need to be in environments without oxygen to produce methane.Methane is a greenhouse gas, like carbon dioxide.Gases such as methane and carbon dioxide trap heat in Earth's atmosphere and contribute to global warming. In its experiments, Keppler's team used sealed chambers（室，房间；腔）that contained the same concentration of oxygen that Earth's atmosphere has.They measured the amounts of methane that were released by both living plants and dried plant material,such as fallen leaves. With the dried plants,the researchers took measurement at temperatures ranging from 30 degrees Celsius to 70 degrees C.At 30 degrees C.,they found,a gram of dried plant material released up to 3 nanograms（微克）of methane per hour(One nanogram is a millionth of a gram). With every 10-degree rise in temperature,the amount of methane released each hour roughly doubled. Living plants growing at their normal temperatures released as much as 370 nanograms of methane per gram of plant tissue per hour. Methane emissions tripled when living and dead plant was exposed to sunlight. Because there was plenty of oxygen available,it's unlikely that the types of bacteria(bacterium的复数，细菌）that normally make methane were involved. Experiments on plants that were grown in water rather than soil also resulted in methane emissions.That's another strong sign that the gas came from the plants and not soil microbes. The new finding is an"interesting observation,"says Jennifer Y. King,a biogeochemist（生物地球化学家）at the University of Minnesota in St. Paul. Because some types of soil microbes consume methane,they may prevent plant-produced methane from reaching the atmosphere.Field tests will be needed to assess the plant's influence,she notes. Which of the following about methane is not mentioned in the passage? A.Plants growing in soil release methane. B.Plants growing in water release methane. C.Soil microbes consume methane. D.Microbes in plants produce methane. 我来回答: 提交
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