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下列食品添加剂中，其试用目的与反应速率有关的是（）。
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阅读下面短文，掌握其大意，然后从21—40各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题纸上将该选项标号涂黑。During the war,my husband was stationed at an army camp in a desert in California.I went to live there in order to be 21 him. I hated the place .I had never 22 been so unhappy . My husband was ordered out on a long-term duty,and I was left in a tiny shack(棚屋) alone. The heat was 23 -almost 125 0F even in the shade of a cactus(仙人掌)。 24 a soul to talk to . The wind blew non-stop ,and all the food I ate ,and the evry air I breathed,were 25 with sand , sand , sand !I was so sorry for myself that I wrote to my parents. I told them I was 26 and coming back home.I said I couldn’t stand it one minute longer. I 27 be in prison! My father answered my 28 with just two lines-two lines that will always sing in my 29 - two lines that completely changed my life :Two men looked out from prison barsOne saw the mud ,the other saw the starsI read those two lines 30 I was ashamed of myself. I made up my mind I would find out what was good in my present 31 ; I would look for the starsI made friends with the natives,and their 32 amazed me. They gave me presents of their favorite artworks which they had 33 to sell to toueists . I studied the delightful forms of the cactus .I watched for the desert sunsets,and 34 for seashells that had been left there millions of years ago when the desert had been an ocean 35What brought about this 36 change in me ? The desert hadn’t changed , 37 I had .I had changed my 38 And by doing so ,I changed an unhappy experience into the most amazing 39 of my life . I was excited by this new world that I had dicovered I had looked out of my self-creatded prison and 40 the stars 25（）
Five Things Nobody Told Me about CollegeAs I type this , I am in my university dorm room. A year ago, when I was awaiting to hear the results of my college applications, I often went to websites for some type of insider look on what college would be like. However, there’s only so much that prep books, websites, and older friends can teach. Here are the top 5things nobody told me about college:61Nobody entering a university knows exactly what they want to study. If they tell you otherwise, they’re lying and will probably change what they want to purse within the first quarter of attendance . During my first quarter at University of California, Riverside (UCR),I thought that I wanted to study Political Science with its focus on International Affairs, so that’s what I applied for. However, once I worked with statewide and local government, I realized that a better fit for me would be Public Policy, and now I am in the process of changing my area.62In college, there are so many good chances for you to meet your expectations. However, there is a very important difference between wanting to do something and applying for something. In order for you to take advantage of the conferences, research, internships ,and fellowships that your university offers, apply! Step into your academic advisor’s office, introduce yourself, and begin making the valuable connections that are necessary to help during the rest of your college career. Great things happen when you step out of your comfort zone, and you would be surprised on how many chances exist if you just ask.63College is where you meet your birdesmaids, neighbors, and potential bosses. The relationships you develop now will probably be linked to the ones you value later, so he wise about the people who you invest yourself in . You are only one person, and you do not have time to waste on people who would rather cause drama or mess up with your purpose. Surround yourself with uplifting individuals who challenge you to be better while loving you for who you are, and be patient to the people who are the complete opposite of that description.64As a first-year, I was afraid to make any noise towards campus issues that I noticed. It was not until I became involved in student government that I gained the confidence to handle projects that I created with the help of ASUCR Office of the President. During my first quarter, I spoke directly to the Chancellor, asking him for support towards my initiavives, met with the Vive Chancellors, and coorerated with my teaching assistances to begin my undergraduate research protect. Nothing good will happen when you are silent.65At my high school,there were about only four active club and organizations that students could be a part of.Imagine my surprise when I stepped foot onto UCR’s capus,where over 400 organizations exist,ranging from political organizations to karate club.You are not paying all or your tuition(学费)to merely go to class,study,pass tests and graduate.Make something worthy out of your experience.Create that you will want to tell your grandchildren one day.It all begins here,by signing up to join an organization. 61（）
阅读下面短文，掌握其大意，然后从21—40各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题纸上将该选项标号涂黑。During the war,my husband was stationed at an army camp in a desert in California.I went to live there in order to be 21 him. I hated the place .I had never 22 been so unhappy . My husband was ordered out on a long-term duty,and I was left in a tiny shack(棚屋) alone. The heat was 23 -almost 125 0F even in the shade of a cactus(仙人掌)。 24 a soul to talk to . The wind blew non-stop ,and all the food I ate ,and the evry air I breathed,were 25 with sand , sand , sand !I was so sorry for myself that I wrote to my parents. I told them I was 26 and coming back home.I said I couldn’t stand it one minute longer. I 27 be in prison! My father answered my 28 with just two lines-two lines that will always sing in my 29 - two lines that completely changed my life :Two men looked out from prison barsOne saw the mud ,the other saw the starsI read those two lines 30 I was ashamed of myself. I made up my mind I would find out what was good in my present 31 ; I would look for the starsI made friends with the natives,and their 32 amazed me. They gave me presents of their favorite artworks which they had 33 to sell to toueists . I studied the delightful forms of the cactus .I watched for the desert sunsets,and 34 for seashells that had been left there millions of years ago when the desert had been an ocean 35What brought about this 36 change in me ? The desert hadn’t changed , 37 I had .I had changed my 38 And by doing so ,I changed an unhappy experience into the most amazing 39 of my life . I was excited by this new world that I had dicovered I had looked out of my self-creatded prison and 40 the stars 29（）
To return to the problem of water pollution , I’d like you to look at a study （） in Australia in 2012.
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