在△ABC中，若 ，则△ABC是（   ）

阅读理解

    Now many young people are traveling around the world on their own, not because they have no one to travel with, but because they prefer to go alone.

    Kristina Wegscheider from California first traveled alone when she was at college and believes that it is something everyone should do at least once in their life." It opens up your mind to new things and pushes you out of your comfort zone. " Wegscheider has visited 46 countries and regions covering all seven continents.

In foreign countries, with no one to help you read a map, look after you if you get ill, or lend you money if your wallet is stolen, it is challenging. This is what drives young people to travel alone. It is seen as character building and a chance to prove that they can make it on their own.

    Chris Richardson decided to leave his sales job in Australia to go traveling last year. He set up a website, The Aussie Nomad, to document his adventures. He said he wished he had traveled alone earlier." The people you meet, the places you visit, or the things you do, everything is up to you and it forces you to grow as a person," said the 30-year-old man.

    Richardson describes traveling alone like" a shot in the arm", which" makes you a more confident person that is ready to deal with anything". He said," The feeling of having overcome something on my own is a major part of what drives me each day when I'm dealing with a difficult task. I walk around with my head up because I know deep down inside that nothing is impossible if you try."

    The great 19th century explorer John Muir once said," Only by going alone in silence can one truly get into the heart of the wilderness. "

在ABC中，，则ABC一定是（ ）

我国的“神舟五号”载人飞船已发射成功，“嫦娥”探月工程也已正式启动。据科学家预测，月球的土壤中吸附着数百万吨的 ，每百吨 核聚变所释放出的能量相当于目前人类一年消耗的能量。在地球上，氮元素主要以 的形式存在。下列说法正确的是（   ）

的内角A，B，C的对边分别是a，b，c，若 ，则 一定为（    ）

We should eat food that is ________to our teeth and our body such as milk，cheese, fish, brown bread, potatoes, red rice, raw vegetables and fresh fruit.

下列有关化学用语表示正确的是（　　）

Excuse me, ______ I'm afraid you can't sit here. This table is reserved.

下列有关化学用语表示正确的是（    ）

请对下面这段新闻报道进行压缩。要求保留关键信息，句子简洁流畅，不超过75个字。

《我和我的祖国》作为新中国成立70周年献礼片，于2019年9月30日上映。上映7天，电影总票房就突破20亿元，稳居国庆档电影票房第一的位置。该电影由七个小故事串联起来，分别讲述了新中国成立之后的七个历史性经典瞬间。电影以小人物反映大时代、展现大情怀。

浓浓的爱国主义精神，感人的爱国情怀，贯穿全片，成为这部作品强大的精神力量和情感力量。《我和我的祖国》的热映也说明一个现象，即普通观众中一直涌动着一股强烈的爱国主义情感，这对当下文艺繁荣发展具有普遍的指导意义。

点 是 所在平面上的两点，满足 和 ，则 的形状是（   ）

People in the countryside still often decorate their doors and windows paper cuttings.

In different countries, people have different senses of h

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(\)划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意:1）每处错误及其修改均仅限一词;

2）只允许修改10处,多者(从第11处起)不计分。

Dear Miss Li,

    How are you? Are you still busy at your work at that school? I'm writing to tell you anything about my new school here. This is a beautiful school with many trees and flowers in it. The classrooms were big and bright. The modern library is full of books on different subject. Every Wednesday afternoon we can go there and lend books. Teachers here are strict in their work and this is what the school is famous. Classes and homework don't take up all your time. After the supper, we usually gather to see the CCTV news so that we can learn that has happened in this world. How luckily I am to be a student in such a wonderful school!

已知 内角 ， ， 所对的边分别为 ， ， ，面积为 .若 ， ，则 的形状是（    ）

由以下粒子结构示意图得出的结论正确的是（   ）

阅读下面这首宋词，完成下列小题。

添字丑奴儿·芭蕉

李清照

窗前谁种芭蕉树？阴满中庭。阴满中庭，叶叶心心，舒卷有余情。

伤心枕上三更雨，点滴霖霪。点滴霖霪，愁损北人^① ， 不惯起来听。

【注释】①北人：北宋灭亡，李清照从故乡山东济南被迫流落到江南，故称“北人”。

以下字音字形全部正确的是（   ）

Marxism (强调理论的重要性) because it can guide action.(emphasise)

用1L1mol•L^﹣1NaOH溶液吸收0.6molCO₂ ， 所得溶液中Na₂CO₃和NaHCO₃的物质的量之比约为（    ）