下列有关热和能的说法中正确的是A. 燃料燃烧释放的热量越多，燃料的热值越大 B. 热量一定是从内能大的物体传

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下列有关热和能的说法中正确的是
A. 燃料燃烧释放的热量越多，燃料的热值越大
B. 热量一定是从内能大的物体传递到内能小的物体
C. 物体的温度升高，可能是从外界吸收了热量
D. 热机做的有用功越多，热机效率越大

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下列数据最接近实际情况的是（　　）
A. 一只成年母鸡质量约为300g
B. 一台家用空调正常工作时功率约为50W
C. 四冲程汽油机的效率约为70%
D. 电磁波在真空中的传播速度约为3.0×108m/s

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许多不法商家为了赚取黑心钱，将劣质煤和优质煤掺和到一起，这两种煤具有不同的
A. 质量 B. 比热容 C. 密度 D. 热值

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假设你是李华，你的英国朋友Chris在给你的邮件中提到他对中国文化非常感兴趣，想请你介绍一项你最引以为傲的中国文化遗产。请你给他回邮件，内容包括:
1.文化遗产的名称;
2.简要介绍;
3.你感到自豪的理由。
注意：1.词数不少于50;
2.开头和结尾已给出，不计入总词数。
Dear Chris，
_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Yours，
Li Hua

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New Lives for Old Phones
When a new mobile phone starts to be sold in stores, many people rush out to buy one. We all want the newest, latest thing.【1】
Mike Townsend works at Total Recall, a mobile phone recycling company. "Don't throw your old phone away. 【2】If you throw it away, it goes with other rubbish to become landfill. In other words, it is put in a big hole in the ground-and it becomes a big problem," he says.
Mobile phones contain some poisonous materials. If your phone goes to a landfill, these poisonous materials can get out and get into the water under the ground. That's the water we need to drink or water goes into rivers or the ocean. 【3】 That's a lot of landfill and a lot of poisonous materials.
"At Total Recall, we separate the old phones into pieces. Most of the materials in the mobile phones can be recycled and used again.【4】 For example, phone batteries contain nickel and cadmium. The nickel is used to make steel, and the cadmium can be used to make new batteries," explains Mike.
"【5】You can usually just take it into a mobile phone shop and they will send it to us," says Mike.
So before you throw that old mobile phone away, use it one last time: search for a recycler near you and give them a call.
A. Send it to us and we'll recycle it.
B. Recycling your old phone is easy.
C. How much is your old mobile phone worth
D. But what should we do with our old mobile phones
E. Millions of mobile phones are thrown away every year.
F. We take apart the old phones and they are used to make new products.
G. Recycling materials helps keep the environment greener and cleaner.

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Who's in control of your life Who's pulling your strings For the majority of us, it's other people-society, colleagues, friends, family or our community. We learned this way of operating when we were very young,of course. We were brainwashed. We discovered that feeling important and feeling accepted was a nice experience and so we learned to do everything we could to make other people like us. As Oscar Wilde puts it," Most people are other people. Their thoughts are someone else's opinions, their lives a mimicry, their passions a quotation. "
So when people tell us how wonderful we are, it makes us feel good. We long for this good feeling like a drug-we are addicted to it and seek it out wherever we can. Therefore, we are so eager for the approval of others that we live unhappy and limited lives, failing to do the things we really want to. Just as drug addicts and alcoholics live worsened lives to keep getting their fix(成瘾物)we worsen our own existence to get our own constant fix of approval.
But, just as with any drug. there is a price to pay. The price of the approval drug is freedom-the freedom to be ourselves. The truth is that we cannot control what other people think. People have their own agenda, and they come with their own baggage and, in the end, they're more interested in themselves than in you. Furthermore, if we try to live by the opinions of others, we will build our life on sinking sand. Everyone has a different way of thinking, and people change their opinions all the time. The person who tries to please everyone will only end up getting exhausted (tired) and probably pleasing no one in the process.
So how can we take back control I think there's only one way-make a conscious decision to stop caring what other people think. We should guide ourselves by means of a set of values- not values imposed from the outside by others. but innate values which come from within. If we are driven by these values and not by the changing opinions and value systems of others. we will live a more authentic, effective, purposeful and happy life.
【1】What Oscar Wilde says implies that .
A. most people have a variety of thoughts
B. we have thoughts similar to those of others
C. other people's thoughts are more important
D. most people's thoughts are affected by others
【2】What does the author try to argue in the third paragraph
A. The price of taking the drug is freedom.
B. We may lose ourselves to win the approval of others.
C. We need to pay for what we want to get.
D. Changing opinions may cost us our freedom.
【3】It can be concluded from the passage that .
A. it's better to follow others' opinions
B. it's important to accept others' comments
C. we shouldn't change our own decision
D. we shouldn't care too much what others think
【4】The author tries to persuade the readers to accept his arguments mainly by .
A. discussing questions B. making suggestions
C. analyzing causes and effects D. providing examples and facts

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下列有关热和能的说法中正确的是A. 燃料燃烧释放的热量越多，燃料的热值越大 B. 热量一定是从内能大的物体传

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