题干

结合下表中所列物质的pH判断,在下列各组物质中,分别能使紫色石蕊溶液变红、不变色、变蓝的是( )

物质

酱油

厕所清洁剂

血浆

牙膏

肥皂水

橘汁

草木灰水

柠檬汁

pH

4.8

1.7

7.4

8.2

9.2

3.5

10.6

2.5

A:柠檬汁、食盐水、厕所清洁剂

B:牙膏、蒸馏水、肥皂水

C:草木灰、蒸馏水、柠檬汁

D:橘汁、食盐水、草木灰水

上一题 下一题 0.0难度 选择题 更新时间:2013-04-20 11:38:02

答案(点此获取答案解析)

D

同类题1

   Ellen Parker was worried about her health. She could not walk very quickly and it was difficult for her to climb stars. She was soon out of breath (气喘吁吁).
   “I suppose I had better go to the doctor,” she thought.
   She went to the doctor and told him her problem.
   “I'm not surprised at all,” he said. “It's obvious what your problem is.”He looked her over then gave her some advice.“If you don't do what I say, Mrs. Parker," he said, "you will have a heart attack. It could kill you.”
   Ellen Parker was very worried as she left the doctor's. She knew that she had to take his advice but it would not be easy and it would take time.
   The next day she went shopping. The first shop she went into was a butcher's shop (肉铺).“I'd like ten pounds of steak (牛排), please,” she said.“Certainly, madam,” the butcher replied and went into the cold room and found a large piece of steak. He brought the huge piece of meat back into the shop and put it on the scale (天平).
   “That's just under ten pounds,"he said.
   “That big enough," Mrs. Parker said.
   The butcher worked out the price.
   “At $4.99 a pound that will be $49.50, please. Would you like me to cut it up into smaller pieces for you?”
   “Oh, I don't want to buy the meat,"Mrs. Parker said.
   “If you don't want to buy it," the butcher replied angrily, "why did you ask me to get it for you?”
   “My doctor told me that I am over-weight and I have to lose ten pounds. I wanted to see what ten pounds of meat looked like.”