题目

Bt基因即苏云金芽孢杆菌（Badcilus thuringiensis）基因，其表达产物伴胞晶体是一种毒性很强的蛋白质晶体，能使一些鳞翅目害虫瘫痪致死。如图为培养转Bt基因试管苗的基本操作过程。（1）Bt基因可从构建的Bt基因组文库中获取，也可以从其cDNA文库中获取，后者获取的基因与前者的区别是______（填“含有”或“不含有”）启动子。若目的基因满足______条件时，也可以通过DNA合成仪用化学方法直接人工合成。（2）图中用到Ti质粒作为载体将Bt基因送入受体When I was in high school, I didn’t know anything about engineering. At that time, when the car I drove needed repairing, I was afraid to take it to the . Because honestly, the mechanic could have me an electric can opener and said, “This is part of your car and it’s -----pay me to fix it.” Then I wouldn’t have known any better.At the end of my junior year of high school, I heard about a summer program to interest girls in engineering. The six-week program was free, and students were college credits and a dorm room at the University of Maryland. I applied to the program, not because I wanted to be an engineer, but because I was looking forward to and wanted to stay away from my parents for six weeks.I was accepted to the program and I earned six engineering credits. The next year I entered the university as an engineering student. Five years later I had a degree and three good job offers.I can’t help shaking I hear about studies that show women are when it comes to math. They imply that I am a little stupid. I’m not, but I know that if I hadn’t met with that summer program, I wouldn’t be an engineer.When I was growing up, I was told, as many students were, to do what I was best at. But I didn’t know what that was. Most people think that when you are something, it comes easily to you. But this is what I discovered: just because a subject is to learn, it does not mean you are not good at it. You just have to grit your teeth and work hard to get good at it. Once you do, there’s good that you will enjoy it more than anything else.【1】A. engineer B. salesman C. factory D. mechanic【2】A. shown B. given C. brought D. taken【3】A. old B. broken C. fixed D. dirtied【4】A. designed B. performed C. controlled D. described【5】A. sent B. afforded C. offered D. awarded【6】A. independence B. success C. happiness D. beauty【7】A. until B. when C. since D. before【8】A. at a disadvantageB. at a loss C. in a trap D. in a shock【9】A. never B. do C. hardly D. nearly【10】A. good at B. bad at C. interested in D. devoted to【11】A. easy B. funny C. difficult D. interesting【12】A. will B. feeling C. desire D. chance