题干

观察与实验是生物科学研究中的重要手段。以下是四位同学在实验室中利用光学显微镜观察到的现象,你认为具有科学性的是(  )

A:甲同学:菠菜的稍带叶肉的下表皮中叶绿体具有双层膜结构

B:丙同学:斐林试剂甲液、斐林试剂乙液等体积混合加入苹果之后,就出现砖红色沉淀

C:乙同学:质壁分离发生时,紫色洋葱鳞片叶表皮细胞中液泡逐渐缩小且颜色逐渐变深

D:丁同学:经苏丹Ⅲ染色后的花生子叶细胞中有紫色的脂肪颗粒

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C

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    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.