题目

科学家培育出多莉羊所采用的生物技术是A．转基因技术B．克隆技术C．嫁接技术D．杂交技术 答案：B解析:多莉羊采用的是克隆技术，所谓克隆，就是利用生物技术，用生物的体细胞培育出一个与亲代一模一样的生物。 Early rising is helpful in more than one way．We all need fresh air．But air is never so fresh as early in the morning．Besides，it is useful to do morning exercises． Secondly，early rising can give a plan to our work for the day．We can not work well without a good plan． Thirdly，early rising gives US enough time to get ready for our work，such as to wash our hands and faces and eat our breakfast． Late risers may find it very difficult to form（形成）the habit of early rising．They have to make an effort（努力）to do so．As the English proverb says，“Early to bed and early to rise makes a man healthy，wealthy and wise．” 1．Air is fresh               ． A．early in the morning                                 B．at the time when you get up C．when you are sleeping                                D．1ate at night 2．Doing morning exercises                 ． A．helps us to remember what we learn          B．is good for our health C．gives us enough time to study                     D．makes us tired and sleepy 3．We can't work well                 ． A．if the weather is bad                                 B．If we get up early C．if we don't have a good plan                        D．if we do morning exercises 4．Early rising gives us enough time            ． A．to get ready for our work                                B．to wash our faces C．to brush our teeth                                      D．to eat breakfast 5．Late risers should try their best               ． A．to sleep as many hours as possible             B．to remember the English proverbs        C．to form the good habit of early rising           D．to get up earlier than everyone else