丝绸之路是沟通欧亚的陆上要道,这条古商路以运送丝绸为主,19世纪下半期,德国地理学家李希霍芬最早将这条古商路称为“丝绸之路”。下面西汉开通的陆上丝调之路简图中,空白处应该填写
A.大秦、长安
B.长安、大秦
C.长安、意大利
D.西安、欧洲
纪念币是为纪念重大事件而发行的法定货币。图2纪念币是为了纪念
A.《权利法案》的通过 B.《人权宣言)的通过
C.《独立宣言》的颁布 D.《解放黑人奴隶宣言)的发表
关于家庭电路和安全用电的说法中,正确的是( )
A . 家庭电路中的空气开关,可以安装在任意位置
B . 家庭电路中同时工作的用电器的多少,完全由用户自己决定
C . 防范触电事故最重要的是要有安全用电的意识,遵守安全用电的原则
D . 正确使用试电笔测火线时,没有电流通过人体保证了人的安全
Whether from news reports or social media articles, you may know that 5G is coming.
5G is the 5th generation network. It is a new network(网络)after 1G, 2G, 3G and 4G and it can connect everyone and everything together. 5G networks will cover/many cities in China soon. 5G means super-fast data(数据) speed, One can download a two-hour movie for fewer than 10 seconds, and it is making our hives more and more convenient.
5G will make self-driving cars possible. For safety, self-driving cars need super-fast data transmission(传输)to communicate with their nearby environment. 5G is just what makes self-driving cars achieve this/Eyen airplanes will become "smart" in the near future. Passengers will be able to use 5G networks in the air to connect to the Internet or place orders for food and drinks.
5G will be a big help for students who take online classes. Many people live in poor areas in the world where there are no schools. But with 5G, this will change. Students all over the world will be able to see places like the Great Wall without leaving their rooms.
It will be also easier for doctors to treat patients remotely by 5G. It means caring for patients from far away.
The fats listed above are only a part of what 5G will make possible and popular. Just as in the early days of the Internet in the 1990s, few could see how it could change or lie and the world. The same will surely be true of 5G. With 5G, many things do not seem like dreams anymore. Now let's get ready to say goodbye to 4G and welcome the coming of 5G.
61. How long may it take to download a two-hour movie with 5G?
A. 15 seconds. B. 8 seconds. C. 10 minutes. D. 2 hours.
62. The underlined word "remotely" means ___________in Chinese.
A. 快速地 B. 高效地 C. 远程地 D. 科学地
63. From the last paragraph, we can know that _________________.
A. 4G is no more used in our daily life now
B. the writer is worried about the coming of 5G
C. with 5G, some of our dreams will come true for sure one day
D. in the 1990s, all the people believed that the Internet would change our life
64. 5G will make the following things more and more popular EXCEPT_____________.
A. self-driving cars B. "smart" airplanes
C. online classes D. hospitals without doctors
65. About 5G, ________________ is NOT mentioned in the passage.
A. to be used freely
B. super-fast data speed
C. to connect everyone and everything together
D. to make life more convenient than 4G
Jonny, a 15-year-old student, is checking his dad’s old jacket. He says, “You’re 45. Dad, you’re never going to wear this again. Can I have it?”
Keith has had a bad day at work, and he is feeling old. And Jonny has hit his pain. Keith raises his voice and says, “What? You mean I’m too old to wear the jacket again?”
Jonny feels like this has come out of nowhere, and now he feels hurt. But I only asked, “Why are you shouting at me?”
“But I don’t like being treated as though I’m too old.” Both of them feel a bit upset.
Have you ever had a similar argument with the people around you? Here are some tips for you to remember when you’re getting mad.
● Accept your feelings and consider the other person’s feelings. That means not always making yourself “right” or “clever” and the other person “wrong” or “stupid”.
● Explain yourself and not the other person, so you can speak out your ideas by starting with “I” but not “You”.
● Don’t always have to reflect before reacting (回应) . If you feel angry, I think it’s a good idea to stop for a moment and understand why.
●Don’t decide the purpose of the other person by your guessing. Try to work out what he or she is feeling, and admit (承认) it if you were wrong.
Don’t forget that it’s never too late to start the ways of communicating.
1 . From the passage, we can know Jonny ________.
A . is school boy B . doesn’t like his dad
C . thinks his dad is too old D . wants his dad’s new jacket
2 . Jonny felt hurt because his dad ________.
A . hit is pain B . had a busy dag C . liked the jacket D . was angry with him
3 . To avoid an argument, the writer gives us ________ suggestions.
A . 2 B . 3 C . 4 D . 5
4 . According to the passage, if you want to express your ideas, you’d better begin like this: “________”.
A . You misunderstood me… B . I know how you feel, but…
C . They’re different from us… D . Things aren’t the same…
5 . The best title for the passage can be ________.
A . Learn to Admit Your Mistakes Bravely
B . Be Patient with the People around You
C . An Argument between a Father and a Son
D . Good Ways of Communication Are Important
下面是与热现象有关的四幅图形,其中说法正确的是( )
A. 图甲中寒冷玻璃上冰花是水蒸气升华而成
B. 图乙中昆虫和植物上的露珠是水蒸气液化而成
C. 图丙是某次温度计读数的示意图,这样读数会使测量结果偏大
D. 图丁是晶体熔化过程中温度变化曲线,其中晶体在BC段不吸收热量
观察图3漫画,下列认识正确的是
①消费者应该拒绝网络购物
②该实物与图片不符,侵犯了消费者合法权益
③消费者只能通过诉讼途径维护自己的合法权益
④消费者可以与商家协商解央问题
A.①② B. ①③ C.②④ D. ③④
在中国近代史上,列强强迫清政府签订了一系列丧权辱国的条约。其中,赔款数目最庞大、主权丧失最严重的不平等条约是()
A.《南京条约》 B.《北京条约》 C.《马关条约》 D.《辛丑条约》
学习兴趣小组对贝壳中碳酸钙的含量进行探究。
(提出问题)如何选择药品和设计装置进行测定?
(查阅资料)贝壳的主要成分是CaCO3,其它成分对实验影响忽略不计室温时,CaCO3不溶于水,CaSO4微溶于水
(设计与实验)实验一:选择药品。分别取等质量颗粒状和粉末状的贝壳样品与等体积、等浓度的稀盐酸在图1的三颈烧瓶中反应,采集数据
(1)图1中反应的化学方程式是_________
(2)据图2分析,选择粉末状样品的依据是________
(3)据图3分析,影响实验测定准确性的原因:一是水蒸气含量增加;二是_____
实验二:设计装置。小组设计了图4装置进行测定
(4)打开活塞,稀硫酸进入试管,观察到的现象是_________。 反应结束后进行读数。读数前调节水准管与量气管液面相平的原因是_____
实验三:优化装置。在老师指导下,小组优化并设计了图5装置进行测定
(5)试剂a是__________
(6)检查该装置气密性的方法是________
(7)加入足量稀硫酸,一段时间后反应停止。再加入氯化铵溶液,发现又产生气泡,推测加入氯化铵的作用是__________
(数据处理)
(8)实验三中,样品质量为m g,加入稀硫酸体积为V1mL,加入氯化铵溶液体积为V2 mL,右侧针筒最后读数为V mL,则反应生成CO2体积为______。该实验条件下CO2密度为d g/mL,则样品碳酸钙质量分数表达式为________
(反思与评价)
(9)与实验二相比,实验三的优点是______(写一点)。
下列各项中字形全部正确的一项是( )
A . 寒喧 伶俐 惊惶 横七竖八 B . 烟蔼 悚然 噩梦 兴高采烈
C . 窥探 形骸 馋言 精明强干 D . 衣襟 渣滓 诡秘 垂头丧气
(1)铁路火车票价格的调整事关人民群众的切身利益,相关部门举行价格听证会后,许多市民通过网络渠道发表自己对火车票价格调整的意见。这是公民通过 ▲ 制度参与民主决策。
(2)设立少年法庭,不公开审理未成年人犯罪案件,这属于对未成年人的 ▲ 保护。
(3) ▲ 是我国人口现状的基本特点。
(4)“人告之以有过,则喜”。这句话说明 ▲ 是我们认识自己的一面镜子。
(5)公民发现危害国家安全的间谍行为可以拨打 ▲ 热线电话向国家安全机关举报。
在 2L 密闭容器内,某气体反应物在 2s 内由 8mol 变为 7.2mol ,则用该气体表示该反应的平均反应速率为
A . 0.4 mol·L −1 ·s −1 B . 0.3 mol·L −1 ·s −1 C . 0.2 mol·L −1 ·s −1 D . 0.1 mol·L −1 ·s −1
空气是一种宝贵的自然资源,下列关于空气的说法正确的是
A . 液氮用于磁悬浮列车和用作保护气,利用了相同的性质
B . 空气中二氧化碳含量比呼出气体中二氧化碳含量高
C . 稀有气体可制成多种用途的电光源,是利用了其物理性质
D . 三大有害气体是 CO 、 CO 2 和 NO 2 , CO 2 和 NO 2 导致酸雨
DNA 分子的多样性取决于( )
A .磷酸基团的排列顺序 B .脱氧核糖的排列顺序
C .碱基对的排列顺序 D .氨基酸的排列顺序
甘地发动的非暴力不合作运动,动员了广大群众,增强了印度人民的自尊心和自信心,打击了哪一国家的殖民统治( )
A.美国 B.日本 C.英国 D.中国
西藏的人口合理容量正在减小,原因可能是( )
① 消费水平迅速提高
② 生产过程中破坏了生态环境
③ 青藏铁路的开通,加强了西藏与外界的联系
④ 自然灾害的增多
A . ①②③ B . ②③④ C . ①③④ D . ①②④