问题 填空题

在下列表格中填上相应的物质名称或化学式.

名称    硫酸钾______    干 冰______
化学式______    CaO______    Fe2O3
名称______   氯化锌______   氢氧化铝
化学式    CaCO3______     CH4______

答案

硫酸钾:由钾元素和硫酸根组成,钾元素显+1价,硫酸根显-2价;根据化合物的化学式书写要求:正价前,负价后,化合价交叉书写在元素在元素符号的右下角,所以硫酸钾的化学式是 K2SO4

CaCO3:由金属离子和酸根组成,属于盐类,读作“某酸某”或“亚某酸某”,故读作碳酸钙;

 CaO:由两种元素组成,读作“某化某”,故读作氧化钙;

氯化锌:由其读法可知,该物质由两种元素组成:氯元素和锌元素,其中氯显-1价,锌锌显+2价,根据化合物的化学式书写要求,氯化锌的化学式是ZnCl2

干冰:是固态的二氧化碳,化学式是CO2;CH4是甲烷;

  Fe2O3:是由铁元素和氧元素两种元素组成,且铁元素显+3价,故读作氧化铁;

 氢氧化铝:由铝元素和氢氧根组成,铝元素显+3价,氢氧根显-1价,根据化合物的化学式书写要求,氢氧化铝的化学式为Al(OH)3; 

故答案为:

名称  硫酸钾  氧化钙   干 冰   氧化铁

化学式

 K2SO4   CaO   CO2   Fe2O3
名称  碳酸钙  氯化锌  甲烷 氢氧化铝
化学式  CaCO3   ZnCl2   CH4   Al(OH)3

完形填空

SECTION B

Directions: Read the following passage. Answer the questions according to the information given in the passage and the required words limit. Write your answers on your answer sheet.

The unsteady housing market is showing a rare sign of strength: waiting home sales were up significantly in February, a report released Monday said, suggesting that Americans took advantage of a tax credit for home buyers.

Sales rose 8.2 percent in February, the National Association of Realtors(房地产经纪人) said. Analysts had expected sales to stay flat.

Economists said Monday’s data suggested buyers were re-entering the market as the April 30 deadline approached for a government tax credit of up to $8,000. The tax credit drove up sales rapidly in the fall, when it was originally set to end, but it has been slow to push the market this spring.

Lawrence Yun, chief economist for the association, said Monday’s report “may signal the early stages of a second wave of home sales.”

A separate report on Monday showed the service division in the United States was improving, driven in part by gains in employment.

The Institute for Supply Management’s non-manufacturing barometer(晴雨表) rose to 55.4 in March, up from 53 in February, going beyond expectations. Much of the energy came from a rush in new orders and business activity.

It was the highest reading(测量或调查的读数) for the survey since May 2006. While employment rose, it was short of the break-even point, signaling the service division was still losing jobs. Exports also rose significantly.

“This is a very encouraging report, which indicates acceleration in demand growth from both domestic and foreign customers,” Barclays Capital researchers wrote in a note on Monday.

The jump in waiting home sales was a rare bit of good news for the housing market, which remains in a deep rut(车辙). Home prices have shown little change.

Analysts expect the housing market to gradually improve as unemployment becomes less and the broader recovery gains steam. But so far, relief has been slow to come.

Monday’s report showed sales rose even in areas hit hard by poor weather in February. Sales climbed 9 percent in the Northeast and South, which were blanketed by snow in February.

The Realtors association bases its data on signed contracts, which usually take one or two months to translate into final sales.

81. What is the effect of the government tax credit? (No more than 5 words)

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82. Who is chief economist for the National Association of Realtors? (No more than 2 words)

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83. What could be a surprise according to Monday’s report? (No more than 10 words)

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84. If you are asked to describe the rise in home sales in February, which word do you think is the most appropriate? (No more than 1 word)

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选择题