—Can your friend ________ Chinese well?

—Yes, he ________.

科举制度在我国封建社会延续了1300多年，发挥了重要作用，后来被历史淘汰。阅读材料，回答问题。

材料一：隋唐科举制……自产生之日起就确立了由政府出面招生，考生“皆怀牒（证件）自列于州县”的自由报考原则，不论贵族和平民皆可参加公开考试。……举凡政治、经济、军事、文化、天文、地理、民族等各种与国计民生相关的大事，皆可为考试内容。……一切以程文（文章）定去留，为草野寒之十开辟了登仁之途……

——杨齐福《科举制度与近代文化》

材料二：西国莫不慕之，近代渐设考试以取人才，而为学优则仁之举。今英、法、美均已见端，将来必至推广。

——丁韪良《西学考略》

材料三：中国进入近代以后，剧烈的社会大变动迫切需要大批与时休相适应的人才，……而科举制度依旧执迷于八股文，小楷试贴，所取之人内不能兴国富帮，外不能御侮抗敌。

——杨齐福《科举制度与近代文化》

已知在△ABC中，∠C=90°，BC=3，AC=4，点D是AB边上一点，将△ABC沿着直线CD翻折，点A落在直线AB上的点A′处，则sin∠A′CD=____ 

      CCTV held a charity show in May to raise money for the earthquake-hit areas in Sichuan. Many famous stars took part in the show. (A) They didn't ask for any pay, they all did it for free. There were a lot of performances like singing, dancing and cross-talks(相声 ). (B)The audience(观众) were so excited that they clapped(鼓掌) their hands all the time. Almost everyone was moved to cry by a lot of sad or moving stories. During the performances, they donated money to the disaster areas(灾区). The show was so successful.
      Besides that, many other stars are doing things for disaster areas in many ways. Kungfu star Jackie Chan and the foundation(基金) named Hong Kong Emperor Group have together donated 10 million yuan. And he also sent his consolation(安慰) to the people in the disaster areas and encouraged them to hold on because “People all over the country are with you.” Xiao Ke, a songwriter, wrote and recorded a song “I Know You Will Come” to warm the hearts of the people in despair(绝望). CCTV's top show “The Same Song” also held a charity special to help them.
       Both the ticket money and the donated money will be sent to the disaster areas. As the Chinese saying goes (C) “One in trouble, all to help.” I believe that the whole world will become better if everyone of us gives charity to others.

一个动物体内某种酶由150个氨基酸组成，控制这个酶合成的基因中核苷酸的个数至少是(  )