问题
单项选择题
监狱观察哨的位置应设在能随时监视到监狱内某一区域的位置上，视线不能被地形挡住，使用DEM分析功能确定观察哨的位置，用到的是DEM的（）分析功能。
A.地形曲面拟合
B.通视分析
C.路径分析
D.选址分析
答案
参考答案：B
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监狱观察哨的位置应设在能随时监视到监狱内某一区域的位置上，视线不能被地形挡住，使用DEM分析功能确定观察哨的位置，用到的是DEM的（）分析功能。
A.地形曲面拟合
B.通视分析
C.路径分析
D.选址分析
参考答案：B
It’s very important that we all recycle (再利用). In nature, everything ___26___ again. For example, when an animal dies, it becomes ___27____ animal’s food. Nothing is wasted. But humans have created things like plastic bags ___28___ can’t be broken down by nature. Our rubbish kills animals and __29___ water and soil. ___30___ we continue making too much rubbish, the problem will only get worse. If nature can’t reuse the rubbish, we must recycle __31__. We should clean up the rubbish we’ve made because nature can’t. Recycling is also the right thing to do for another reason. The earth is rich in natural materials like water and trees, __32 __ these materials are not endless. We use up our natural materials much _ _33 __ than the earth is able to reproduce them. For example, each year we cut __34 __ more that 6,000 square miles of forest. But it takes an average of 25 years for a new tree __35__. Recycling can help us save the earth, so let’s take action right now.
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