题干

人们的生活、生产与化学息息相关,下列说法正确的是(    )

A:复旦大学研究的能导电、存储的二维材料二硫化钼是一种新型有机功能材料

B:中国天眼用到碳化硅、芯片用到高纯硅、石英玻璃用到硅酸盐

C:中国歼-20上用到的氮化镓材料是当做金属合金材料使用的

D:石墨烯弹性气凝胶制成的碳海绵可用作处理原油泄漏的吸油材料

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D

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    Everyone has experienced ups and downs in his life, and I am no exception. I am an aerospace engineer from India. I was told by my relatives, close friends and others that it was1for a non- IT student to pursue a master's degree in IT and graduate from a US university.

    I had never taken courses2to computers or programming. I was never interested in being a3, but things changed. Computers became my companion and I4how dependent on them I was. I5imagining the back end processes happening inside the CPU and they amazed me. That's why I6 to pursue a master's degree in IT.

    At first, it was rather too7. Coming from a middle-class family, the huge cost per credit was a big8. My English accent was terrible. Most9, the course seemed impossible at first. But I never 10

    I got a few offers, but I decided to choose my university 11it promised its students to help them learn practically. During my first month, it was difficult to understand the Americans' 12and finish my assignments. But I never gave up. I 13two miles to the university every day so that I could use my travel money to buy a meal. I started looking for 14and I got an offer to work as a student assistant, which meant lifting benches and chairs every day.

    I took it as a(n)15, and I believed that hard work was my strength. Right now I am graduating with a GPA of 3.96/4 and a job offer from a multinational company that has asked me to start right after 16 

    If you think you can never achieve something, you need to 17yourself and start working on your 18  Hard work always pays off. To be 19  you need to start from somewhere and always question yourself about the limits of how far you would go to 20your goals.