题目内容
建立一个学生信息表student，要求它由学号sno，姓名sname，性别sex，年龄age，4个属性组成，其学号属性惟一，学号、姓名字段不能为空。下列语句正确的是
查看答案
搜索结果不匹配？点我反馈
更多问题
That an ecological crisis confronts humankind is now so central to our thinking that the notion that human beings adapt to their natural environment seems obvious. But ecological interpretations of world history are surprisingly recent. Sociologists, in attempting to classify societies, have looked increasingly to a people' s relationship with their natural environment and, provide food, clothing, and shelter. Human beings meet these needs in a wide variety of environments, including deserts, rain forests, grasslands, and so on. Such environments are part of ecosystem, complex web of interdependencies among organisms, communities of organisms, and the natural habitual. Some societal variation derives from the different demands made by different ecosystems. Customs and ways of life that would be adaptive in one ecosystem would be maladaptive in another.
We confront a habitat and evolve a mode of existence not so much as lone individuals, but cooperatively as larger social units. Social organization and technology are our chief adaptive mechanisms. Social organization develops as we create stable, ordered relationships and become infused with common cultural traits. Much depends on whether or not our values, norms, beliefs and institutions favor or foreclose new avenues of adaption. Likewise, technology —the application of knowledge for practical ends allows us to harness and change aspects of our environment. In its broadest sense, technology entails the practical arts and skills of human society. As technology has become more advanced, we have gained access to greater amounts of non human energy (animal, water, fossil fuel, solar, and so on). In turn, new sources of energy have allowed our cultures to expand and change. Other changes follow as well.
The author points out that differences in people's ways of life come from______.
能为CPU所处理的数据存放在(28)中。
听力原文： About one-hundred-thirty-five million people around the world have diabetes. They have high levels of the sugar called glucose in their blood. Glucose levels increase when the body lacks or cannot use the hormone insulin. This results in diabetes. The disease damages blood vessels. It injures the kidneys, eyes and nerves. It stops blood flow to the feet and legs. And it increases the chances of heart disease and strokes.
There are two kinds of diabetes. Type One develops in children or young adults. Type Two develops in older adults. The new study involved Type Two diabetes.
Which of the following items may not be injured by diabetes？
【B5】
微信支付 
支付宝支付