问题 填空题

(1)铝是一种化学性质比较活泼的金属,但通常铝制品却很耐腐,这是因为______.

(2)实验室的废酸液不能直接倒入下水道,其原因是______.

(3)工人师傅在切割钢板时,常用CuSO4溶液画线是因为(用方程式表示)______.

答案

(1)铝在空气中能与氧气反应,其表面生成一层致密的氧化铝薄膜,从而阻止铝进一步被氧化,故铝制品具有较好的耐腐蚀性;

(2)酸液能与活泼的金属反应,所以废酸液倒入下水道有可能会腐蚀下水管道中的金属材料,所以不能直接倒入;

2)铁与硫酸铜溶液反应生成红色的铜覆盖在钢板表面使切割线清晰,该反应的化学方程式为:Fe+CuSO4═Cu+FeSO4

故答案为:(1)铝在空气中能与氧气反应,其表面生成一层致密的氧化铝薄膜,从而阻止铝进一步被氧化;

(2)酸液能与活泼的金属反应,所以废酸液倒入下水道有可能会腐蚀下水管道中的金属材料;

(3)Fe+CuSO4═Cu+FeSO4

完形填空

第二节:完形填空(共10小题;每小题1分,满分10分)

阅读下面短文,掌握其大意,然后从第31至第40小题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。

Tony was a poor student. He was trying to pay his way through school(半工半读). One day, he was  31   goods from door to door in the street. He found that he only had one penny left. He was very  32   so he decided to beg for a meal at the next house.

However, Tony changed his mind when a lovely young woman  33   the door. Instead of a meal, he asked for a drink of water. She thought he looked hungry so she brought him a large glass of  34   . Tony drank it slowly, and then asked, “How much do I owe you?”

“You don’t owe me anything,” she replied. “Mother has taught me never to  35   pay for a kindness.” Tony said, “Then I thank you from the bottom of my heart.” 

Years later Tony became a famous doctor in a big city. One day, the young woman became very ill. The local doctors finally sent her to the big city,  36   specialists could be called in to study her rare disease.  37    Tony heard the name of the town she came from, a strange light filled his eyes.

Dressed in his doctor’s gown Tony went in to see her. He  38   her at once. He decided to try his best to save her life.

After a long struggle, Tony succeeded. He asked the business office to pass the final bill to him for approval(批准). He looked at it and then wrote  39   on the side. The bill was sent to her room. She was afraid to open it  40   she was sure that it would take the rest of her life to pay it off. Finally she looked, and the note on the side of the bill caught her attention. She read these words:

“Paid in full with a glass of milk.”

31. A. making         B. buying        C. giving          D. selling

32. A. thirsty          B. full          C. hungry          D. tired

33. A. opened         B. broke         C. knocked        D. mended

34. A. wine           B. milk          C. water           D. tea

35. A. give            B. offer         C. accept          D. lend

36. A. which          B. when         C. how            D. where

37. A. When          B. But          C. However         D. Though

38. A. married        B. recognized     C. cured            D. hurt

39. A. something      B. anything       C. nothing          D. none

40. A. whether        B. if            C. because          D. though

填空题