Chen Zijiang, whom I interviewed for my article on Chinese Art, is a paper-cutting expert.

在△ABC中，若sin²A+sin²B＜sin²C，则△ABC的形状是（   ）

R分子的质量为a g，相对质量为M，则M与a的比值等于（　　）

若 是

一定量CO₂通入500mL某浓度的NaOH溶液中得到溶液A，向A溶液中逐滴滴入稀盐酸，加入n(HCl)与生成n(CO₂)的关系如图所示。下列有关叙述不正确的是（   ）

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Easy Ways to Keep Your Brain Sharp

    Everyone is forgetful, but as we age, we start to feel like our brains are slowing down a bit—and that can be a very annoying thing.  Read on for some techniques worth trying.  

    ⒈

    People who regularly made plans and looked forward to upcoming events had a 50 percent reduced chance of Alzheimer's disease (阿茨海默症), according to a recent study.  Something as simple as setting a goal to have a weekly coffee date with a friend will do. There's evidence that people who have a purpose in life or who are working on long or short-term goals appear to do better. In other words, keep your brain looking forward.  

    ⒉Go for a walk.

    Mildly raised glucose (葡萄糖) levels can harm the area of the brain that helps you form memories and physical activity can help get blood glucose down to normal levels. In fact, exercise produces chemicals that are good for your brain.

    ⒊Learn something new.

    Take a Spanish class online, join a drawing club, or learn to play cards. A study found that mental stimulation (刺激) limits the weakening effects of aging on memory and the mind. But the best thing for your brain is when you learn something new and are physically active at the same time.  Or go dancing with your friends.  

A. Focus on the future.

B. This can be especially harmful to the aged.

C. It should be something like learning gardening.

D. So take a few minutes each day to do some reading.

E. But don't worry if your schedule isn't filled with life-changing events.

F. Luckily, research shows there is a lot you can do to avoid those moments.

G. In other words, when you take care of your body, you take care of your brain.

Generally speaking , almost all the kids are ______about how everything around them works.

把19.2g 的Cu放入足量的稀硝酸中，微热至Cu完全反应．已知：

3Cu+8HNO₃（稀）=3Cu（NO₃）₂+2NO↑+4H₂O求：

The traffic is terrible, p in the city center.

Adopting a green lifestyle is recognized to be one of the best solutions the protection of our environment.

阅读下面这首诗歌，完成下面小题｡

回忆

昌耀

白色沙漠

白色死光｡

西域道

汉史张骞凿空

似坎坎伐檀｡

晋高僧求法西行，困进在小雪山的暴寒，

悲抚同伴冻毙的躯体长呼——命也奈何！

大漠落日，不乏的仅有

焦虑｡枕席是登陆的

码头｡

心源有火，肉体不燃自焚，

留下一颗不化的颅骨｡

红尘落地，大漠深处纵驰一匹白马｡

下列句子中不含通假字的一项是（   ）

根据短文内容，从下框的A—F选项中选出能概括每一段主题的最佳选项。选项中有一项为多余选项。

A、One Important Factor in Conversation B、It's not Difficult to Talk Well. C、A Famous Master of the Art D、Pronunciation and Usage E、What Makes a Good Talker F、Talk with Strangers

（1.）

    The ancient Greeks were very good at making conversations, and the greatest talker of them all was philosopher Socrates. His pupil, Plato, recorded some of his supposed conversations, and we read them in ‘The dialogues' of Plato. In many classrooms today, Socrates' method of teaching is used.

（2.）

    The best talkers appear to have a great interest in and love for their fellow creatures; a curiosity about the world in general; some powers of observation and reflection; respect for their own opinions and tolerance for those of others; and quick thinking. And they talked for the fun of it, not to show off their knowledge.

（3.）

    A good voice must have the help of good speech, whose two assistants are clear enunciation(清晰发音)and correct pronunciation. Poor enunciation may suggest to your listeners that you lack consideration, and that you are not especially concerned about their opinion of you.

（4.）

    Pronunciation is settled by common agreement of the community or group speaking the particular language or dialect. For standard pronunciation of words, a dictionary is your best friend. The usage of words is somewhat the same as pronunciation. To be accurate in your use of words is very important in your conversation. Dictionaries usually provide the usage of words. So whenever you meet with new words, it is a good idea to look them up in the dictionary.

（5.）

    Think of meeting a stranger as a chance to have a good time to talk, to make a friend. Look with a smile directly into the other's eyes when you are introduced, and shake hands with a firm, friendly clasp. This will give you confidence. Then try to have a smooth and pleasant conversation with him.

阅读理解

    When Christopher Reeve was picked to play the role of a superhero in films in 1977, audiences across the country cheered. Like Superman, he seemed nearly invincible(不可战胜的). He skied, sailed, flew planes, went diving, rode horses, played tennis, and did them all with skill and ease. No one could imagine Christopher Reeve any other way.

    All that changed on May 27, 1995, when Christopher was in a three-day horse riding competition in Virginia. A terrible accident happened to him, which resulted in paralysis(瘫痪) from the neck down and not breathing on his own. Doctors gave him only a 50-50 chance of surviving at all.

    Gathering his courage, he began to fight for his life. A few days later, Christopher accepted an operation that helped restore(恢复)some feeling to his upper body. Still, doctors emphasized(强调) his limitations. He would never walk again. He would never even breathe again without the aid of a respirator(呼吸器). But Christopher proved the doctors wrong. Later, he was able to breathe on his own.

    Soon after that, Christopher felt ready to face the world again. He had a message to spread. He wanted to tell people that no matter what challenges they faced, they shouldn't give up. Wherever he appeared, his speeches met with ovations(欢呼) and many teary faces. Christopher also went back to work: directing films, which proved he had not lost his creative spark.

    Christopher had his share of "down" times, but after the tears, he always said, "And now, forward!"

He died at age of 52 on Oct. 10, 2004, after several years of living and working with his severe (严重的)disability. He still was—and always will be—Superman!

大作文。

词典中，“味道”一词义项丰富，其中有：（1）滋味；（2）趣味；（3）意味。

请以“味道”为题，写一篇不少于700字的记叙文。

下列各组互为同位素的是（   ）

在 中，满足 ，则下列说法中错误的是（    ）

阅读下面的两段文言文，回答问题。

（一）

古之学者必有师。师者，所以传道受业解惑也。人非生而知之者，孰能无惑？惑而不从师，其为惑也，终不解矣。生乎吾前，其闻道也固先乎吾，吾从而师之；生乎吾后，其闻道也亦先乎吾，吾从而师之。吾师道也，夫庸知其年之先后生于吾乎？是故无贵无贱，无长无少，道之所存，师之所存也。

嗟乎！师道之不传也久矣！欲人之无惑也难矣！古之圣人，其出人也远矣，犹且从师而问焉；今之众人，其下圣人也亦远矣，而耻学于师。是故圣益圣，愚益愚。圣人之所以为圣，愚人之所以为愚，其皆出于此乎？爱其子，择师而教之；于其身也，则耻师焉，惑矣。彼童子之师，授之书而习其句读者 ， 非吾所谓传其道解其惑者也。句读之不知，惑之不解，或师焉，或不焉，小学而大遗，吾未见其明也。巫医乐师百工之人，不耻相师。士大夫之族，曰师曰弟子云者，则群聚而笑之。问之，则曰：“彼与彼年相若也，道相似也。位卑则足羞，官盛则近谀。”呜呼！师道之不复可知矣。巫医乐师百工之人，君子不齿，今其智乃反不能及，其可怪也欤！

（选自[唐]韩愈《师说》）

（二）

汉魏以来，神仙术士之学浮屠老子之书递易纵横莫知所尚盖数百年于兹矣。唐承其弊，是以一时士大夫之流，鲜不自鸣得意，竞耻相师，文公以一布衣周旋其间，而欲挽八代之颓风，洗一时之旧染，自非传道、授业、解惑三大端矣，不足以正流品而广善类。然持之过激，与言不得其人，则其道不传，而其业难受；其业难受，而其惑愈不解矣。今者李氏子蟠，不拘世俗，非所谓出类拔萃而知所向往者乎？文公作说以贻，因以嘉来学而奖后进。

（选自[清]李扶九《古文笔法百篇》）

根据题目要求填空：

（1）Mg²⁺的结构示意图为　 　；O的电子式为　 　；H₂S的结构式为　 　．

（2）氯化钠的电子式为　 ，溶于水发生电离的电离方程式为　 ，向氯化钠溶液中滴入硝酸银时发生反应的离子方程式为 

The League member is brave, honest and hard-working. In a word, he is a good boy of many ______.