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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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在社会工作专业里，社会工作者掌握社会政策非常重要。与其他公共政策相比，社会政策的特征包括（）。
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利用Bind/DNS漏洞攻击的分类主要有（）
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我国在夏季奥运会上实现金牌“零”的突破是在1952年，而在冬季奥运会上实现金牌“零”的突破是在1992年。
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横拍握法的特点（）
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某机关回答对方来函所提问题的函叫（）
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患者女，5岁，因“腹痛、腹泻，伴恶心、呕吐”来诊。MRI检查：胰体部占位，直径4cm。切面见肿块灰白色，实性，局部见坏死。最可能的病理诊断是（）
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将成绩在90分以上的记录找出后放在一个新表中，比较合适的查询是（）。
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假定空气密度ρ不随高度变化的大气为（）。
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中央预算单位按照规定的程序变更、撤销银行账户，需报经（）批准.