2.Climate change has caused a rise in sea levels.This has increased the amount of salt in fresh water used on coastal farms.As a result farmers are increasingly unable to use fields close to the sea.
Scientists call this process"salinization."(鹽堿化)But a farmer in the Netherlands is now using a mixture of sea and fresh water to grow healthy and tasty vegetables.Marc Van Rijsselberghe started with an experiment.He put several kinds of plants in saline.
"We put a lot of plants in the fields and then we put them in fresh water and in sea water,and then we see which variety is surviving and which variety is dying."
Mr.Van Rijsselberghe worked on the project with scientists from the Free University of Amsterdam.He divided a farm into eight irrigated areas.Separate pipes pumped fresh and sea water,and a computer program created water with eight levels of salinity.Computerized measuring devices called"sensors"controlled the water levels and the levels of salinity.Mr.Van Rijsselberghe says he was able to harvest vegetables from most of the eight test areas.He says the vegetables were smaller than those grown in fresh water.But he says they also have more sugar and salt,so they taste better.
The farmer grew carrots,cabbage,onions and beetroot.But he found that potatoes grew better than the other vegetables in the combination of sea and fresh water.Mr.Van Rijsselberghe says four kinds of these potatoes were recently sent to Pakistan,where thousands of hectares of land have been damaged by salinization.Farmers in Pakistan will test the Dutch potatoes to see if they can be grown in those fields.
28.What's the purpose of the author mentioning the climate change in the first paragraph?B
A.To show the reason for a rise in sea levels.
B.To introduce the topic of the passage.
C.To tell readers the amount of salt in sea water has increased.
D.To tell readers that farmers are unable to use fields close to the sea.
29.What's"salinization"?D
A.There is much salt in fresh water.
B.There is the most salt in fresh water.
C.There is less salt in fresh water.
D.There is more and more salt in fresh water.
30.From the passage we can learn thatD.
A.Marc conducts the experiment all by himself
B.the vegetables have more salt than sugar
C.carrots grow well,as was expected
D.the experiment is to find out which variety is more suitable for sea water
31.Why were potatoes recently sent to Pakistan?B
A.Because Pakistan lacks potatoes.
B.Because Pakistan has also been damaged by salinization.
C.Because potatoes are in great demand in Pakistan.
D.Because the people in Pakistan like eating more potatoes.
分析 本文是一篇說明文,講述了世界各地由于土地鹽堿化,很多植物都不能存活.科學家們通過實驗,找出能在海水里種植的農(nóng)作物,來克服土地鹽堿化造成的損失.
解答 28~31.BDDB
28.B 考查文章主旨.說明文通常將文章主題放在開頭的第一段,所以作者在第一段提到氣候變化的目的是為了引入文章主題.故選B.
29.D 考查細節(jié)理解.根據(jù)"This has increased the amount of salt in fresh water used on coastal farms"可知,鹽堿化是指水中含鹽量增加.故選D.
30.D 考查推理判斷.根據(jù)"We put a lot of plants in the fields and then we put them in fresh water and in sea water,and then we see which variety is surviving and which variety is dying"可知,這個實驗是為了找出哪個品種更適合在海水里生長.故選D.
31.B 考查細節(jié)理解.根據(jù)"these potatoes were recently sent to Pakistan,where thousands of hectares of land have been damaged by salinization"可知,巴基斯坦的土地也被鹽堿化所破壞.故選B.
點評 閱讀理解考察學生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.