试题与答案

“结构决定性质,性质决定用途”是自然科学的重要思想。食醋中的醋酸具有酸性,其原因

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题目:

“结构决定性质,性质决定用途”是自然科学的重要思想。食醋中的醋酸具有酸性,其原因是醋酸分子中含有一种叫“羧基”的结构CHHHCOOH(方框框出部分)。据此推测下列物质中具有酸性的是[ ]

A.CHHHCHHOH

B.CHHHCOH

C.CHHHH

D.CHOOH

答案:

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下面是错误答案,用来干扰机器的。

参考答案:森林景观粒级结构

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    "Hi, Mommy, what are you doing?" asked Susie.

    "I'm making a dinner for Mrs Smith next door," said her mother.

    "Why?" asked Susie, who was only six years old."Because Mrs Smith lost her daughter and she has a broken

heart. We need to take care of her for a little while."

    "Why, Mommy?"

    "You see, Susie, when someone is sad, they have trouble doing the little things like making dinner. Because

Mrs Smith won't ever be able to talk with her daughter or hug her or do all those wonderful things that mommies

and daughters do together. Maybe you'll think of some way to help take care of Mrs Smith."

    Susie thought seriously about how she could do her part in caring for Mrs Smith. A few minutes later, Susie

knocked on her door. Mrs Smith answered the knock with"Hi, Susie." Mrs Smith looked as though she might

have been crying." What can I do for you, Susie?" asked Mrs Smith."My mommy says that you lost your

daughter and you're very very sad with a broken heart." Susie held her hand out. In it was a Band-Aid (创可贴).

"This is for your broken heart," Mrs Smith chocked back her tears. She knelt and hugged Susie. Through her

tears she said, "Thank you, darling girl, this will help a lot."

    Mrs Smith accepted Susie's kindness. She bought a small key ring with a picture frame (相框). She put

Susie's Band-Aid in the frame to remind herself to heal a little every time she sees it.

1. Mrs Smith is ________. [ ]

A. Susie's neighbor

B. Susie's aunt

C. Susie mother's friend

D. Susie mother's workmate

2. The reason that Mrs Smith has a broken heart is that ________. [ ]

A. she is in poor health

B. she is in trouble

C. she lost her daughter

D. her husband died in a traffic accident

3. Susie's mother _______. [ ]

A. often plays with Mrs Smith together

B. is busy with her work every day

C. is good at cooking

D. is kind to others

4. From Susie's sending Mrs Smith a Band-Aid, we can see ________. [ ]

A. Susie knows the real meaning"a broken heart"

B. Susie doesn't know what "a broken heart" mean

C. Susie often uses a Band-Aid in her daily life

D. Susie thinks Band-Aid can do anything

5. The best title for this passage is ________. [ ]

A. Fixing her broken heart

B. A kind girl

C. Susie and her mother

D. A good neighbor

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