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化学教材不包括（）。
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氢化可的松的主要作用（）
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不稳定型心绞痛高危组包括（）
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某商业大厦的服务员应保持愉悦的笑容和友善的态度，他们的绩效考评最好采用（）考评。
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哮喘患者应用氨茶碱与下列哪种药物合用不需要减量（）
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下列支持胸水漏出液的诊断是（）
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Once we learn the rules for map reading, they seem so simple: up is north, blue is water, a star stands for a capital. But when and how do we learn to read a map? Research shows that even three-year-olds can master, at least in a basic way, the key map-reading concept(概念): a map is a two-dimensional symbol(二维的符号)for three-dimensional space. Linda Acredolo of the University of California, showed a child a map of a room pointed out on it where a toy was hidden and asked the child to find that toy. Depending on the maps orientation(方位), about half the three-year-olds could successfully do so. Three years may be the age at which the ideas become fully understood. Judy Deloache of the University of Illinois let children watch her hide a small toy in a scale model of a room and asked them to find a large one in a real room. "A three-year-olds can do it, but a two-year-olds has no idea that the model has to do with anything larger, " she says. But even if the basic concept is there early, Lynn Liben and Roger Downs of Pennsylvania State University found that children still have a lot to learn. Second graders believe that north is always at the top of a map because of the hanging maps they have seen. "If you asked them to close their eyes and point in the direction of north, often theyll point straight up," says Lihen. She says that children get map-reading skills gradually, and teachers must begin by using maps of familiar areas: their own classrooms, homes, and neighbourhoods.The first two experiments show that______.A．children have better understanding than grown-upsB．children have special natural ability for map readingC．children are more interested in toys than in mapsD．children can start to learn map-reading early
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常用抗生素除青霉素、头孢霉素和灰黄霉素外，绝大多数都由放线菌产生。()
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工作总结一般不包括下列哪项内容（）。
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计算机程序员修改了工资程序，这样在每个工资处理周期，操作员的工资支票的美元数值将翻倍。能够检测和预防这种欺诈行为的控制是（）。