Governments around the world are pushing for an end to plastic straws ( 吸管 ) and bags. More and more businesses are turning to paper products as a choice. Paper is considered by many to be better than plastic. However, it, too, is harmful to the environment.
Firstly, paper bags and straws are made from trees. Trees, as you know, can reduce ( 减少 ) carbon dioxide ( 二氧化碳 ) levels in the atmosphere. They can slow down climate ( 气候 ) change. An increase in the use of paper bags can cause more acts of cutting down trees.
Secondly, products made from paper require more energy and water. About 10 percent more energy and four times as much water is used to produce a paper bag than a plastic one. You might say that we can use recycled paper to save that energy and water. This seems to be a good idea. However, it takes even more energy and water to go through the recycling process than to make a brand new paper bag. Products made from recycled paper are also often short-lived.
Thirdly, paper products are heavier than plastic ones. That means they require more oil to transport. Seven trucks are needed to transport two million paper bags, while only one truck is needed to transport the same number of plastic bags. The increased weight also leads to a large amount of waste once the bags are thrown away.
Paper products are actually a lose-lose for both the environment and businesses. They are more expensive than plastic products. A paper straw costs about 5 to 12 cents, while a plastic one usually costs only about 2 cents.
The most environment-friendly solution is to avoid single-use products altogether. Products like glass water bottles and steel straws can be used over and over again. They are much better than either paper products or plastic products. Through increasing the use of these products, you can greatly reduce your throwaway waste and truly make our Earth a greener place!
1 . What does the underlined word “ They ” in Paragraph 2 refer to?
A . Plastic products. B . Trees. C . Paper products. D . Businesses.
2 . Compared with transporting two million plastic bags, transporting two million paper bags requires ________.
A . fewer trucks B . six more trucks C . twice as many trucks D . the same number of trucks
3 . The writer compared the price of a paper straw and that of a plastic straw to show that ________.
A . paper products are not a good choice for businesses
B . it is difficult for all businesses to turn to paper products
C . most people believe paper products are better than plastic ones
D . paper products are as harmful to the environment as plastic ones
4 . By writing this article, the writer mainly wanted to ________.
① compare plastic products with paper ones
② correct people’s wrong ideas about paper products
③ suggest people use reusable products like steel straws
④ list the advantages and disadvantages of using paper products
A . ①② B . ③④ C . ①④ D . ②③
玻璃仪器洗涤干净的标志是( )
A. 容器内壁看不到污物,呈无色透明状
B. 冲洗时倒出的水是无色透明的
C. 仪器内壁的水既不成股流下也不聚滴
D.上述中的任意一种标志均表示仪器已经洗净
足迹 | 制度篇 | 会议篇 | 人物篇 | 思想篇 | 统一篇 |
典型事例 | 三大改造 | ② | 邓小平 | ④ | ⑤ |
理由 | ① | 标志着中国进入改革开放新时期 | ③ | 全党全国人民为实现中华民族伟大复兴而奋斗的行动指南 | 祖国统一大业迈出重要一步 |
材料二 改革开放以来,中国共产党人把马克思主义基本原理同中国改革开放的具体实际结合起来,团结带领人民进行建设中国特色社会主义新的伟大实践,使中国大踏步赶上了时代,实现了中华民族从站起来到富起来的伟大飞跃。这一伟大飞跃以铁一般的事实证明,只有中国特色社会主义才能发展中国!
(3)依据材料二,概括新中国取得举世瞩目成就的原因。
《中国诗词大会》弘扬了中国传统文化。下列诗句反映的物质变化主要为化学变化的是
A . 千淘万漉虽辛苦,吹尽狂沙始到金 B . 千锤万凿岀深山,烈火焚烧若等闲
C . 花气袭人知骤暖,鹊声穿树喜新晴 D . 无边落木萧萧下,不尽长江滚滚来
下面一组图片反映的主题是( )
A . 早期的殖民掠夺 B . 印度民族大起义
C . 巴拿马收回运河主权 D . 亚非拉国家的民族独立运动 .
下列我国人民币背面的风景图案中,体现桂林山水景观的是( )
阅读图文资料,回答问题.
材料一:近年来,为推动区城经济一体化发展,我国提出“一带一路”的国家发展战略.“一带一路”是“丝绸之路经济带”和“21世纪海上丝绸之路”的简称.它贯穿欧亚大陆,东连亚太经济圈,西接欧洲经济图.
材料二:“一带一路”规划图
(1)A大洲地形以_________为主,平均海拔低.
(2)B国地域辽阔,矿产丰富,其中_________资源储量居世界第一,大量出口,其产值在该国经济中占重要地位.
(3)D地区以_________人种为主,擅长击鼓和雕刻,创造了绚丽多彩的文化.
(4)E是_________运河,连接了红海和地中海,从而沟通了印度洋和大西洋.
(5)下列选项中,与C地气候类型相符合的是_________(填字母).
请用化学用语填空。
(1)两个氢原子_________。
(2)构成氯化氨的基本微粒是离子,则阳离子的化学符号为_________。
(3)氧离子的离子结构示意图_________。
(4)标出氯化铁中铁元素的化合价_________。
若集合 ,
,其中
,
,
,
,
是从定义域 A 到值域 B 的一个函数,则
_____ .
2018年政府工作报告指出,要坚持教育优先发展,改善乡村义务教育学校办学条件。《中国农村教育发展报告2019》显示,我国乡村教师队伍建设向好发展。我国重视乡村教育,坚持教育优先发展,是因为( )
①力求使乡村孩子获得平等的发展机会
②教育公平是社会公平的重要基础
③优先发展教育和科学是建设先进文化的中心环节
④教育是实现中华民族伟大复兴的关键
A. ②④ B. ①③ C. ①② D. ③④
2020是鸦片战争爆发180周年,我们把鸦片战争作为中国近代史开端的主要原因是
A.被迫签定不平等条约
B.国家主权遭到严重破坏
C.自然经济开始瓦解
D.社会性质开始发生变化
以下存放和取用药品的方法不合理的是( )
A. 锌粒存放于广口瓶中 B.盐酸存放于细口瓶中
C.用滴管取用大量液体 D.用药匙取用碳酸钠粉末
If you walk through a park in the morning or in the evening, you might see a lot of people doing these slow and beautiful movements— Carry the tiger over the mountain and White crane spreads its wings . In fact, they are doing Taichi .
Taichi is an ancient martial art ( 武术 ). It is a common kind of exercise in China. More than 100 million people in over 150 countries practice Taichi at present. Recently UNESCO ( 联合国教科文组织 ) has added Taichi to its Intangible Cultural Heritage List ( 非物质文化遗产名录 ). Many taichi fans were happy to hear of it. “This will make taichi more popular around the world. Hopefully, more people will become healthier by practicing it.” said Chen Bin. He is a Taichi master from the village of Chenjiagou, Henan Province. This village is the birthplace of Chen-style Taichi.
It’s true that doing Taichi is good for our health. It can make us walk and move more freely, and it can also make us stronger. During slow movements, we can focus on ( 专注 ) our hands and feet. We can control them better. Slow movements also help us to take deep and long breaths.
Taichi also focuses on the harmony ( 和谐 ) between yin ( 阴 ) and yang ( 阳 ). It shows how the ancient Chinese people saw the world. The world is full of yin and yang: dark and light, soft and hard, female and male. But they don’t oppose ( 对立 ) each other absolutely ( 绝对地 ). As we see in the picture, a white spot is in the black area and a black spot is in the white area. After a dark night, the sun will rise. Leaves fall in autumn but grow in spring. Everything keeps changing — that is how we should see the world.
Taichi carries traditional Chinese philosophy ( 哲学 ), such as being in harmony with nature and using softness to beat hardness. It has become a symbol of Chinese culture.
1 . How many people practice Taichi in the world now?
A . About 10 million. B . Less than 150 thousand.
C . At most 100 thousand. D . More than 100 million.
2 . Which of the following words can best describe the movements of Taichi?
A . Slow and beautiful. B . Slow and exciting. C . Fast and free. D . Strong and tiring.
3 . Why has Taichi been added to Intangible Cultural Heritage List recently?
A . Because it is a symbol of Chinese culture. B . Because it is from the village of Chenjiagou.
C . Because it can make us walk more freely. D . Because it can use softness to beat hardness.
4 . What is the author’s purpose in writing the passage?
A . To ask people to do Taichi in their fiee time.
B . To introduce an ancient martial art—taichi.
C . To teach people how to do Taichi correctly.
D . To explain why Taichi is good for our health.
下列图形中,既是中心对称图形又是轴对称图形的是( )
A . B .
C .
D .
“ 哪有什么岁月静好,只不过有人替你负重前行 ” ,启示我们要学会感恩,主动承担责任。( _______ )
已知氯化钠、碳酸钠在不同温度时的溶解度如下:
温度 | 0 | 10 | 20 | 30 | 40 | |
溶解度/g | 氯化钠 | 35 | 35.5 | 36 | 36.5 | 37 |
碳酸钠 | 6 | 10 | 18 | 36.5 | 50 |
(1) 依据上表数据,绘制出氯化钠和碳酸钠的溶解度曲线(如图),图中能表示碳酸钠溶解度曲线的是______(填“A”或“B”)。
(2)图中两溶解度曲线相交于M点,此点表示的意义是______;
(3)40℃时,把50gA物质放入100g水中,充分搅拌所得溶液是______溶液(填“饱和”或“不饱和”)。