题干

汽车的启动电源常用铅蓄电池,放电时的电池反应如下:
PbO2 + Pb + 2H2SO4 = 2PbSO4↓+ 2H2O,根据此反应判断下列叙述中正确的是:

A:PbO2是电池的负极

B:负极的电极反应式为:Pb + SO– 2e = PbSO4

C:PbO2得电子,被氧化

D:电池放电时,溶液酸性增强

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答案(点此获取答案解析)

B

同类题3

阅读理解

    Hollywood's only Chinese-American superhero has stirred up heated debate on social media after she spoke out against discrimination in American show business.

    Chloe Bennet, a Chinese-American actress who stars in Marvel's trending TV series Agents of S.H.I.E.L.D., explained on social media why she changed her last name from Wong to Bennet, arguing that Hollywood is “racist” and wouldn't cast her with a last name that made them “uncomfortable.”

    “Changing my last name doesn't change the fact that my BLOOD is half Chinese, that I lived in China, speak Mandarin, or that I was culturally raised both American and Chinese,” replied Bennet.

    Bennet's remarks come after Ed Skrein stepped down from his role as Major Ben Daimion in the upcoming Hellboy movie for fear that his participation would be “whitewashing” a character of Asian descent(后裔).

    Racial barriers have been an essential problem in Hollywood. According to research conducted by the University of Southern California in 2015, nearly three-quarters of all characters in the top 100 films of 2014 were white, while only 5.3 percent of Asian artists can share the same privilege. In another report released in 2017, only 3.4 percent of over 1,000 surveyed films had an Asian director.

    “Asian artists can hardly stand out in Hollywood. Most roles starred by Asians are fixed and stereotyped, as if all Asians are good at math and martial arts. There is an invisible discrimination lurking(潜伏) in show business, as the difference of your skin color may bring disparity in your income and opportunities,” said Alex She, a New York-based Chinese-American photographer and movie maker.

    Bennet's experience has led to heated debate on both Chinese and foreign social media.

同类题5

阅读材料,完成下列要求。

材料一:中国古代社会的一个根本特点是,自商周以来,血缘亲族和地缘关系一直是中国社会人际关系的深层结构。在此后三千多年的历史长河里,先秦时代的姓族宗法组织转型为秦汉以后的宗族组织,又转型为唐宋以后的姓氏亲族组织,再转型为明清以下直到现代的乡村家族组织,虽然在形态上历经演变,但其基本结构却始终保持不变,并积淀为中国人的深层价值观。……中国的政治家都把治家的方式用于治国,家庭伦理结构成为政治法律结构的原型;中国的官僚政治机构,事实上就是一种虚拟的政治亲属辈分结构。中国的皇帝与臣民、官与民的关系,不仅是一种政治上的隶属和统治的关系,也是一种伦理亲族关系,这从皇帝被称为“君父”、清官被称为百姓的“父母官”就可以看出来;这与欧洲中世纪君臣间的关系仅是隶属或者契约关系截然不同。

——《为什么孔子始终打不倒?》

材料二:从很早的时期起,这种血缘亲族关系的纽带在希腊社会中就被打破了,就不再成为维系社会结构的基本关系了。公元前六世纪,由民主主义政治家克里斯提尼所推动的政治和社会改革,其中一项重要内容,就是打破和改造雅典社会结构中残存的血缘亲族组织。希腊城邦不是一个封闭的农业社会,而是一个开放的商业社会。商品经济的发达,航海贸易往来的频繁和扩大,大量外邦人的迁入定居,所有这些,都从根本上腐蚀和瓦解了古希腊社会中那种血缘性的亲族组织。

——《希腊文明的论证》