题目

下列有关细胞工程的叙述，不正确的是（ ） A．细胞工程应用的是细胞生物学和分子生物学的原理和方法 B．可以通过在细胞水平或细胞器水平上的操作，按照人的意愿来改变基因结构 C．可以通过在细胞水平或细胞器水平上的操作，按照人的意愿来获得细胞产品 D．根据操作对象的不同，可以分为植物细胞工程和动物细胞工程两大领域When our son Bradley was ten, the new bicycle he had received earlier that year was stolen. Owning a bicycle was a big deal to our children when they were little. They spent hours and hours, day after day, on their bicycles, riding up and down the footpath, and at the front of the house. We also rode together as a family a lot. Bicycling was a great way to get the kids out of the house and into the fresh air without spending any money.Bradley had discovered that his bicycle had been stolen from our backyard in Campbelltown, South Australia, when he and his sister went outside for a morning ride. He couldn't believe that someone would do this.He got a large piece of cardboard, painted a sign begging for the bicycle to be returned, and tied the sign to the letterbox. The following morning, when I went out to collect the mail, I found a white envelope with the magical words, "Buy yourself a new bicycle", There was a $100 banknote inside.We were very touched that someone had the heart to do this. We’ve never been able to thank the person but we suspect(猜想)that it may have been one of our wonderful neighbors, Bradley painted a big “____▲______!” on the sign and we left it outside for a couple of weeks afterwards, hoping the kind stranger would drive down our street.A delighted Bradley was able to buy a new bicycle. As the years went on, the bicycles became bigger and more expensive but remained just as important for those family bicycle rides, Now Bradley is 25. Sometimes I miss the days when receiving a bicycle was the best thing in the world to them.All these years later we are still thankful for the strangers kindness. We were a young family with three little children and it meant a lot to us. We still talk about it and, even now, wonder who the kind stranger was.1.According to the passage, Bradley often______ when he was a child.A. rode a bike B. made signs C. took a walk D. collected mail2.Which of the following is the best to fill in the blank in Paragraph 4?A. Come back B. Thank you C. A new bicycle D. A good boy3.From the action of the stranger, we can learn that______.A. love builds a warm family B. a special memory lasts longC. happiness makes a better life D. a kindness helps others a lot4.The best title for the passage can be_____.A. A rich stranger B. A thankful motherC. A bicycle for Bradley D. A banknote for the family 1.A 2.B 3.D 4.C 【解析】文章讲述了作者的小儿子的自行车被偷了，小男孩期待它能回来，于是写了一个牌子，第二天他们在信箱发现100元钱，让他自己买个新自行车，我们一直不知道这个好心的陌生人是谁，我们一直很感恩。 1.根据They spent hours and hours, day after day, on their bicycles, riding ...