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问题 填空题

在长为12㎝的线段AB上任取一点M，以线段AM为边作正方形，则这正方形的面积介于36㎝2与81㎝2之间的概率为          。

答案

题目分析：正方形的面积介于36与81之间，则边长介于6与9之间，依据几何概型概率的求解方法可得概率为

点评：几何概型概率的求解通常利用的是长度比，面积比或体积比

单项选择题

高血压病人舒张压超过下列哪项时，麻醉危险性大增（）

A.舒张压110mmHg

B.舒张压90mmHg

C.舒张压100mmHg

D.舒张压115mmHg

E.舒张压125mmHg
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单项选择题

Geography is the study of the relationship between people and the land. Geographers compare and contrast various places on the earth. But they also (51) beyond the individual places and consider the earth as a whole. The English word geography means "to describe the earth. " (52) geography books focus on a small area like a town or city. Others deal with a state, a region, a nation, or an (53) continent. Many geography books deal with the whole earth. Another (54) to divide the study of geography is to distinguish between physical geography and cultural geography. The former focuses on the natural world; the (55) starts with human beings and studies how human beings and their environment act (56) each other. But when geography is considered as a single subject, (57) branch can neglect the other. A geographer might be described as one who observes, records, and explains the (58) between places. If all places (59) alike, there would be little need for geographers. We know, however, that no two places are exactly the same. Geography, (60) is a point of view, a special way of looking at place.

59().

A.being 

B.are 

C.be 

D.were
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