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问题 选择题

右图中，A、B、C、D依次表示你消化道中的某个部位，曲线（X、Y、Z）表示淀粉、脂肪、蛋白质在你消化道中被消化的程度。能代表馒头消化程度的曲线是（ ）

A.X　　   B.Y　　　C.Z　　   D.都不是

答案

答案：A

考点：

分析：做这类的题首先要学会识图．还要知道糖类、蛋白质和脂肪的消化过程，糖类在口腔内就开始消化，蛋白质在胃内开始消化，脂肪只能在小肠内消化．这三类营养物质在小肠内都消化．

解答：解：营养物质进入消化道的先后顺序是：口腔、咽、食道、胃、小肠、大肠和肛门，其中具有消化功能的器官是口腔、胃、小肠．淀粉在口腔内就开始消化，蛋白质在胃内开始消化，脂肪只能在小肠内消化．

（1）从图中可以看出，物质X最先被消化，然后是物质Y被消化，最后是Z被消化，可以判断X是淀粉，Y代表蛋白质，Z代表脂肪．

（2）图中X、Y、Z都能在D消化道内被消化，可以判断D代表小肠；X在A中开始消化，则A代表口腔；Y在C中开始被消化，则C代表胃．故答案为：X．

故选A

点评：蛋白质、糖类和脂肪的消化情况要注意重点复习．

单项选择题

扫轨板距轨面不应大于（）。

A、10mm

B、15mm

C、20mm

D、50mm
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问答题

Almost all our major problems involve human behavior, and they cannot be solved by physical and biological technology alone. What is needed is a technology of behavior, but we have been slow to develop the science from which such a technology might be drawn, (46) One difficulty is that almost all of what is called behavioral science continues to trace behavior to states of mind, feelings, traits of character, human nature, and so on. Physics and biology once followed similar practices and advanced only when they discarded them, (47) The behavioral sciences have been slow to change partly because the explanatory items often seem to be directly observed and partly because other lands of explanations have been hard to find. The environment is obviously important, but its role has remained obscure. It does not push or pull, it selects, and this function is difficult to discover and analyze. (48). The role of natural selection in evolution was formulated only a little more than a hundred years ago, and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied. As the interaction between organism and environment has come to be understood, however, effects once assigned to states of mind, feelings, and traits are beginning to be traced to accessible conditions, and a technology of behavior may therefore become available. It will not solve our problems, however, until it replaces traditional pre-scientific views, and these are ply entrenched. Freedom and dignity illustrate the difficulty. (49) They are the possessions of the autonomous (self-governing) man of traditional theory, and they are essential to practices in which a person is held responsible for his conduct and given credit for his achievements. A scientific analysis shifts both the responsibility and the achievement to the environment. It also raises questions concerning "values". Who will use a technology and to what ends (50) Until these issues are resolved, a technology of behavior will continue to be rejected, and with impossibly the only way to solve our problems.

(48)The role of natural selection in evolution was formulated only a little more than a hundred years ago, and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied.
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