题目

化学与工业生产有着密切的联系，下列说法中正确的是（ ）A. 与12C互为同素异形体的14C可用作文物鉴定B. 因铝的化学性质活泼，故不能用铝槽车储运浓H2SO4C. 海水淡化的方法有蒸馏法、电渗析法、明矾净水等方法D. 石油裂解、煤的气化等过程中都包含化学变化 答案：【答案】D【解析】A. 14C可用作文物鉴定，但14C与12C互为同位素，A错误；B.Al是比较活泼的金属，容易被浓H2SO4氧化而在金属表面产生一层致密的氧化物保护膜，阻止金属的进一步氧化，即发生钝化现象，所以可用铝槽车储运浓H2SO4，B错误；C.明矾净水是除去水中悬浮的固体颗粒，不是海水淡化的方法，COn June 26, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could now read the whole “map” of the human body: DNA. DNA is something that everybody has, and it tells the body what to do. DNA is the reason that we look like our mother and father, because we get some of their DNA to make our own.People have been trying to understand the human body for a long time. In 1860, Gregor Mendel discovered a special reason why we look the same as other people in our family. It is because of small things named “genes” in our body. In 1953, James Watson and Francis Crick made another discovery and found out that those small parts are real messages written in the DNA with a special language.In 1961, Marshall Nirenberg and Johann Matthaei found a message in DNA showing how DNA tells the cell (细胞) to build its parts. Scientists have now found all the words in the DNA map, but we still do not understand what they all do. By understanding what just one “word” means, we can help save more people from several illnesses.Most people hope that this will help make better medicine and help sick people. Other people worry that when people begin to know more words and find out lots of other information, we might use it in a wrong way, just to make people more attractive, or stop sick people from getting jobs. Man would have to meet a lot of trouble if DNA technic wasn’t limited in use. 根据短文内容，选择最佳答案。1.What did the two scientists first discover in 1961?A. The “map” of DNA. B. A new illness.C. The language of DNA. D. A message of DNA.2.What can we do if we understand some “words” of the language inside the body?A. Make people get new jobs. B. Make medicine for illnesses.C. Make maps of human. D. Make people less attractive.3.What do people think about this work?A. It can cause good or bad results. B. It can cause only good results.C. It can cause good results but won’t work. D. It can cause only bad results.