有A、B两种烃,含碳的质量分数相同,关于A、B的下列说法正确的是( ) A.A和

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问题:

有A、B两种烃,含碳的质量分数相同,关于A、B的下列说法正确的是(  )

A.A和B一定是同分异构体

B.A和B不可能是同系物

C.A和B的最简式一定相同

D.各取1 mol A和B完全燃烧生成CO2的质量一定相同

考点:烷烃的通性环烷烃(环己烷、环丙烷等)乙烯
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B

Studies show that laughter is something that makes you feel calm or relaxed for both physical and psychological wounds though it may seem futile to laugh in the face of pain and fear.

When Dan Rather interviewed comedian Bill Cosby just one week after his son, Ennis, was killed, Cosby said, “I think it is time for me to tell people that we have to laugh. You can turn painful situations around through laughter. If you can find humor in anything, you can survive it.”

Call it a flashlight for dark times: laughter just seems to adjust attitude better than anything else. Inspirational speaker Steve Rizzo recalls a TV interview with an injured firefighter a few days after 9.11.The man had fallen more than 30 stories in one of the towers and had broken a leg. Everyone was crying, and the reporter asked, “How is it that you’ve come out of this alive?” He looked at her and without missing a beat, said, “Look, lady, I’m from New York and I’m a firefighter; that’ all you need to know.”

“Everyone laughed and though the laughter was only a couple of seconds,” says Rizzo. “Sometimes that’s all you need to catch your second breath. Laughter gives you that couple of seconds. You’re sending a message to your brain, and the message is: If you can still laugh even a little among the pain, you are going to be OK.”

Of course, there is a difference between laughing off a serious situation and laughing off the fear that results. The firefighter was doing the latter, states Rizzo, the author of Becoming a Humorous Being, and so should we. “If there is anything we have learnt from 9.11, it’s how precious life really is,” she says. “We have to send a message that our spirit won’t die. One important thing that unites us is our ability to laugh.”   

60.The writer uses the examples of the comedian and the firefighter to show              .

A.laughter is a good way to get rid of pain and fear

B.laughter is the best way to cure psychological wounds

C.it is your attitude that decides whether you can survive the pain or not

D.laughing off a serious situation is different from laughing off the fear that results

61.We can infer from the passage that Steve Rizzo is                        .

A.a reporter   B.a soldier       C.a firefighter  D.a doctor

62.The underlined word futile in the first paragraph means                .

A.hopeless   B.useless   C.careless  D.worthless

63.From the passage, we can know that Americans are                 .

A.really inspired after 9.11     B.hardly united after 9.11

C.nearly surprised by 9.11     D.greatly hurt by 9.11

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劳务分包人不得将合同项下的劳务作业()或在()给他人。

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自然保护区的()只准进入从事科学研究观测活动。

A.核心区

B.缓冲区

C.试验区

D.限制区

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短路引弧就是使电极直接与工件接触引弧。()

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无砟轨道精调完成后气温变化或升高()度需重新复测。

A、5

B、10

C、15

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