18.A buld-it-yourself solar still(蒸餾器) is one of the best ways to obtain drinking water in areas where the liquid is not readily available.Developed by two doctors in the U.S.Department of Agriculture,it's an excellent water collector.Unfortunately,you must carry the necessary equipment with you,since it's all but impossible to find natural substitutes.The only components required,
though,are a 5'×5'sheet of clear or slightly milky plastic,six feet of plastic tube,and a
container-perhaps just a drinking cup-to catch the water.These pieces can be folded into a neat little pack and fastened on your belt.
To construct a working still,use a sharp stick or rock to dig a hole four feet across and three feet deep.Try to make the hole in a damp area to increase the water catcher's productivity.Place your cup in the deepest part of the hole.Then lay the tube in place so that one end rests all the way in the cup and the rest of the line runs up-and out-the side of the hole.
Next,cover the hole with the plastic sheet,securing the edges of the plastic with dirt and weighting the sheet's center down with a rock.The plastic should now form a cone( 圓 錐 體 ) with 45-degree-angled sides.The low point of the sheet must be centered directly over,and no more than
three inches above,the cup.
The solar still works by creating a greenhouse under the plastic.Ground water evaporates (蒸發(fā)) and collects on the sheet until small drops of water form,run down the material and fall off into the cup.When the container is full,you can suck the refreshment out through the tube,and won't have to break down the still every time you need a drink.
32.What do we know about the solar still equipment from the first paragraph?B
A.It's delicate.
B.It's portable.
C.It's complex.
D.It's expensive.
33.What does the underlined phrase"the water catcher"in paragraph 2 refer to?A
A.The still.
B.The tube.
C.The hole.
D.The cup.
34.What's the last step of constructing a working solar still?D
A.Dig a hole of a certain size.
B.Put the cup in place.
C.Cover the hole with the plastic sheet.
D.Weight the sheet's center down.
35.When a solar still works,drops of water come into the cup formC.
A.the plastic tube
B.outside the hole
C.beneath the sheet
D.the open air.
分析 本文是一篇說明文,主要介紹了一款簡易蒸餾器的建造和使用方法.
解答 32.B推理判斷題,根據(jù)句子These pieces can be folded into a neat little pack and fastened on your belt.這些碎片可以折疊成一個整潔的小包裹,并系在你的腰帶上.說明制整流器的設(shè)備很輕便,portable"輕便的,手提的"所以答案選B.
33.A 推理判斷題.根據(jù)句子Try to make the hole in a damp area to increase the water catcher's productivity.可知最好再潮濕的地方挖洞,以提高節(jié)水器的工作效率.在洞的底部放一個杯子,杯子上方用覆蓋膜遮擋.所以答案選A.
34.D細(xì)節(jié)理解題.根據(jù)第三段Next,cover the hole with the plastic sheet,securing the edges of the plastic with dirt and weighting the sheet's center down with a rock.可知最后一步是weighting the sheet's center down with a rock"放一塊石頭在覆蓋膜的中間,把它壓下去",
35.C推理判斷題.結(jié)合第四段中的Ground water evaporates (蒸發(fā)) and collects on the sheet until small drops of water form,run down the material and fall off into the cup可知地下水蒸發(fā),在覆蓋膜上聚集起來直到形成小水滴落在杯子里.覆蓋膜是在杯子上面的,水滴落入杯子里.所以水滴是凝聚在覆蓋膜的下面.
點評 閱讀理解題測試考生在閱讀基礎(chǔ)上的邏輯推理能力,要求考生根據(jù)文章所述事件的邏輯關(guān)系,對未說明的趨勢或結(jié)局作出合理的推斷;或根據(jù)作者所闡述的觀點理論,對文章未涉及的現(xiàn)象、事例給以解釋.考生首先要仔細(xì)閱讀短文,完整了解信息,準(zhǔn)確把握作者觀點.