中角A，B，C的对边分别为a，b，c.若 ，则 的形状为（    ）

阅读下面一首元曲，回答下题。

双调 蟾宫曲

    【元】阿鲁威①

    动高吟楚客秋风，故国山河，水落江空。断送离愁，江南烟雨。杳杳孤鸿。依旧向邯郸道^②中，问居胥今有谁封?何日论文，渭北春天，日暮江东。

【注】①阿鲁威：蒙古族人，曾任南剑(今福建南平)太守。此曲是赴任南剑太守时，途中所作。②邯郸道：典出自“黄梁梦”故事，喻指求取功名的道路。

△ABC中，三边长a，b，c满足a³+b³=c³ ， 那么△ABC的形状为（   ）

在 中，如果 ，则 的形状是（    ）．

m g某金属M溶于盐酸中，放出的气体在标准状况下的体积为n L，并生成氯化物MCl₂ ， 则金属M的相对原子质量是（   ）

在V L Al₂(SO₄)₃溶液中加入过量氨水，过滤得沉淀，然后在高温中灼烧沉淀最后得白色固体m g，则溶液中SO₄^2-的物质的量浓度是（   ）

用1L 0.1mol·L^-1NaOH溶液吸收0.07molCO₂ ， 所得溶液中n(Na₂CO₃)和n(NaHCO₃)之比约为（   ）

Right, many buildings are still under c

阅读下面的宋词，完成下列小题。

双声子·晚天萧索

柳永

晚天萧索，断蓬踪迹，乘兴兰棹东游。三吴风景，姑苏台榭，牢落暮霭初收。夫差旧国，香径没、徒有荒丘。繁华处，悄无睹，惟闻麋鹿呦呦。

想当年、空运筹决战，图王取霸无休。江山如画，云涛烟浪，翻输范蠡扁舟。验前经旧史，嗟漫载、当日风流。斜阳暮草茫茫，尽成万古遗愁。

阅读理解

    As Internet users become more dependent on the Internet to store information, are people remember less? If you know your computer will save information, why store it in your own personal memory, your brain? Experts are wondering if the Internet is changing what we remember and how.

    In a recent study, Professor Betsy Sparrow conducted some experiments. She and her research team wanted to know how the Internet is changing memory. In the first experiment, they gave people 40 unimportant facts to type into a computer. The first group of people understood that the computer would save the information. The second group understood that the computer would not save it. Later, the second group remembered the information better. People in the first group knew they could find the information again, so they did not try to remember it.

    In another experiment, the researchers gave people facts to remember, and told them where to find the information on the Internet. The information was in a specific computer folder(文件夹). Surprisingly, people later remember the folder location(位置) better than the facts. When people use the Internet, they do not remember the information. Rather, they remember how to find it. This is called "transactive memory(交互记忆)".

    According to Sparrow, we are not becoming people with poor memories as a result of the Internet. Instead, computer users are developing stronger transactive memories; that is, people are learning how to organize huge quantities of information so that they are able to access it at a later date. This doesn't mean we are becoming either more or less intelligent, but there is no doubt that the way we use memory is changing.

I have lots of (suggest) for the park's future.

氮化铝（AlN）被广泛应用于集成电路生产领域。在氮气（N₂）流中由氧化铝与焦炭在高温条件下制得氮化铝：Al₂O₃+N₂+3C 2AlN+3CO。若有14 kg的氮气参加反应，可生成氮化铝的质量为多少？

现有250mL浓度为2.0mol/L的硫酸和含1mol氢氧化钠的溶液，足量的铝屑．用上述原料生产Al（OH）₃的量最多时消耗铝的质量为（   ）

阅读理解

    Missing friends who live far away? Or just need a little family comfort after a long day? Sometimes you just need a hug. And sometimes there's just no one around to give you one. So what do you do? How about a virtual hug?

    Scientists at the Massachusetts Institute of Technology(MIT)have invented a social media vest(社交背心)that allows people to give hugs to their friends, family and loved ones on Facebook.

    The vest is called Like-A-Hug, which is connected with your Facebook page. Whenever Facebook friends "Like" a photo, video or anything you post on the network, a fan will blow air into the vest to give you a hug. Hugs can also be sent back to the sender by pressing the vest to lose air, according to the website of designer Melissa Chow.

    She worked with Andy Payne and Phil Seaton at the MIT Media Lab to build the black vest, making the wearer "feel the warmth, encouragement, support, or love that we feel when we receive hugs." Melissa Chow said, "We came up with the idea over a free talk about long-distance relationships and the shortcomings of video chat interfaces(视频聊天界面)like Skype. "

    Chow and her workmates finished work on the vest, and it has drawn the attention of the public.

    Chow provided no pricing or ordering information for the Like-A-Hug vest, so don't expect to see people blowing up all over town just yet.

    Although researchers believe that Like-A-Hug will cause a worldwide storm, a lot of people think it can't take the place of the feeling of a real hug. Body temperature or the taste of hair and so on is far from what a social vest can match.

某粒子的结构示意图为 ，  关于该粒子的说法正确的是（   ）

在 中,已知 ,则此三角形一定为(    )

在 中，若满足 ，则 一定为（    ）

They lost their way in the forest, and ___ made matters worse was that night began to fall.

以A（4，3，1），B（7，1，2），C（5，2，3）三点为顶点的三角形的形状是（   ）

The(对面的)house belongs to my uncle. Let's walk across the street and visit him.