问题 问答题

某农民欲在一块土地上种植甜菜,他查阅资料得知甜菜是一种适合于在偏碱性土壤里生长的植物。 

(1)请你设计实验帮助该农民测定其土壤的酸碱度。(写出主要操作步骤) 

                                                                                        

(2)若测得该土壤的pH约为5,你认为这块土地是否适合种植甜菜?为什么?                                                                                                                      

(3)若你认为适合,应从下列物质中选择哪种物质对这块土地进行改良?            

 供选物质:①酸性肥料 ②熟石灰 ③氢氧化钠

答案

(1)取土壤样品,加入适量蒸馏水,搅拌,溶解,静置一会儿,用玻璃棒沾取上层清液到PH试纸上,对比比色卡。

(2)不适合,因为甜菜是一种适合于在偏碱性土壤里生长的植物,而这里的土壤PH=5,显酸性

(3)②

完形填空

第三节:完形填空:(共10小题,每小题2分,满分20分)

阅读下面短文,掌握其大意,然后从21~30各题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

Homebuyers nationwide are watching housing prices go up, up, and up. “How high can they go ?” is the common question that    46    in the city is asking. But right now, few people seem to have the answer.  “    47    interest rates(利率) stay at about 5 percent, there’s  no way of knowing,”, said a local Guangzhou economist.

“It’s crazy,” said Li Hua, who is    48    a house near the river. “In 1993, I bought my first place, a two-bedroom apartment in Haizhu district, for 100,000 yuan. My friends thought that I was overpaying and said it just wasn’t worth it. Five years later , I had to move to Shenzhen. I   49    it for 160,000 yuan, which was nice profit. Last year, while    50    friends here, I saw in the local paper that exact same    51    was for sale for 450,000 yuan!”

It is a seller’s    52    . Homebuyers feel like they have to offer at least 10 percent more than the asking price just to have a chance. Li Hua says the situation is really diffcult. “Whether you decide to buy or decide not to buy, you still feel like you made the    53    decision. If you buy, you feel like you overpaid. If you don’t buy, you want to kick yourself for passing up a great    54    .”

Everyone says prices must fall, but everyone hopes it will happen the day after they sell their house.   55    government officials have no idea what the future will bring. “All we can say is that these things change,” said the state director of housing.  “What goes up must come down.”

46.  A. everybody     B. somebody       C. nobody       D. anybody

47.  A. When         B. As long as       C. Before       D. As soon as

48.  A. looking at      B looking out      C. looking after   D. looking for

49.  A. bought         B. sold           C. got           D. gave

50.  A. visiting        B. watching       C. making        D. having

51.  A. friend         B. apartment      C. house         D. bedroom

52.  A. shop          B. home          C. house         D. market

53.  A. right          B. wrong         C. strong         D. weak

54.  A. opportunity     B. time         C. happening      D. pity

55.  A. Even           B. When        C. As            D. Though

实验题