题目

你校英文报正开展关于“courage and determination”的征文活动，请你结合自己的经历，写一篇短文投稿，讲述你成长过程中关于勇气与毅力的故事。注意：1）词数80左右；2）请在答题卡的相应位置做答。 答案：I will never forget the first time when I learned how to ride a bike. At the beginning, with dad holding the back of the bike, I rode happily and safely. After some time, Dad told me he would let go of the bike and that I should ride independently. Though scared, I took a deep breath and gave it a try. It was not easy. After several attempts, I finally rode the bike steadily. At that moment, I fel下列物质中只能做氧化剂的是 [　　] A．B． C．D．