题干

汽车安装使用催化净化装置是减少汽车尾气对空气污染的有效方法之一.其主要发生催化剂的化学反应方程式为:2NO+2CO __ 2CO2+X下列对该化学反应的说法不正确的是(   )

A:反应物都属于氧化物

B:X是N2,因为反应前后原子的种类和个数不变

C:反应前后所有元素的化合价都没有发生变化,该反应的基本类型属于置换反应

D:催化剂在反应前后质量和化学性质都不改变

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C

同类题1

富是民之本,强乃国之基。民族复兴,富强繁荣,始终是一代又一代中国人为之奋斗的理想和目标。阅读下列材料,完成相关问题。

材料一:国家财政收入不增加,军事工业便不可能发展。而国家要增加财政收入,必须首先使国家富起来。在这种形势下,洋务派提出自强先“求富”,强调以“富”为基础和兴办民用工业以“求富”的主张……但因为企业受到清王朝及官僚的控制,其生产规模、利润分割要听命于清王朝,带上了浓厚的封建性。企业能否发展,与封建势力的控制往往成反比。

——赵德馨著《中国近现代经济史1842~1949》

材料二:辛亥革命后,尤其是第一次世界大战期间,曾出现过中国民族工业发展的“黄金时代”,然而人们殷殷向往、已在招手的建设机会很快丧失了,中国并没有出现随政治革命而来的“产业革命”。个中缘由,过去只强调了帝国主义的侵略。帝国主义没有支持南京临时政府,这是事实。但更主要的原因在于封建政治势力的破坏,革命党人非但没有能力制约封建军阀,反而一步步受到封建军阀的制约。胜利的辛亥革命推动了实业的发展,而随之而来的军阀统治和军阀混战,又窒息了民族工业的发展。

——陈旭麓著《近代中国社会的新陈代谢》

材料三:从经济增长的角度来衡量,第一个五年计划是一个令人吃惊的成功。国民收入年平均增长率为8.9%(按不变价格计算),农业和工业的增长量每年分别约为3.8%和18.7%……第一个五年计划的特征是明显的加速度。

——(美)费正清主编《剑桥中华人民共和国史》

材料四:中国在过去的三十多年里进行的经济改革,不仅提高了公民总体的物质生活水平,也给他们带来了更多的自由和更大的流动性。中国发展了一种充满活力的社会主义市场经济,能够挑战美国经济主导地位,并且提供了一种不同于西方民主的国家发展模式。

——(美)弗兰克·萨克雷 约翰·芬德林主编《世界大历史——1900至反恐战争》

同类题5

任务型阅读

Five ways to improve creativity

    Creativity is the ability to go beyond traditional rules, ideas or relationships and create something new through imagination or progressiveness. There are many ways to improve your creative mind.

    Exercise the mind. Exercising your mind is an ideal way to boost creativity. Like the body, the mind needs exercise to work the creative muscles and make them stronger. Exercise your brain by learning new subjects, getting into a debate about politics and talking to other creative and intelligent people.____

    Be passionate. One aspect of creativity is passion.____ Find your internal motivation and follow your passion to improve your creativity.

    Change your routine.____To boost your creativity, consider changing one to two elements of your daily routine. If you are working on a certain project, consider stopping one project to work on another project at regular intervals throughout the day or week.

    Read. While reading provides many intellectual benefits, reading is also beneficial for boosting creativity, exercising your brain and provide creative inspiration.____Consider reading about subjects that were previously uninteresting to you. This change in the norm might spark your creative interest.

    ____ Our packed schedules have no room for creative thinking. Take a certain amount of time every day to quiet, refresh and clear the mind while relaxing the body. This quiet time can consist of a yoga workout, meditation or simply sitting still in a dark and quiet room, in a peaceful garden or on a beautiful beach.

A. Schedule quiet time.

B. It can become weak due to stresses

C. Creativity is a natural quality

D. Often, creativity is blocked due to a too familiar routine

E. These activities will encourage a flow of creativity.

F. Read as much as possible about several different subjects.

G. Typically, students will do well in subjects they are interested in