题目

21．正常情况下，有丝分裂产生的子细胞与母细胞相比，保持不变的是 A．蛋白质的含量                        B．染色体的数量   C．细胞器的数量                        D．RNA的含量 答案：BDo you like travelling? If you are interested, come to our travel service as soon as possible. We offer the following travel lines for you to choose.2-Day Yangzhou Colourful Group TourHow about going to Yangzhou for the weekend? You can visit Slim West Lake, Ge Garden, Daming Temple and taste Huaiyang delicious food such as Yangzhou fried rice and Fuchun buns.Tour Price:￥690 Call us at 800-817-72234-Day Qingdao Private(私人的) TourQingdao is famous for its sunshine, white sandy beaches and clear water. You can relax here, walking along the beaches and breathing the fresh air!Tour Price:1 person2-5 persons6-9 persons￥669￥550/person￥530/personCall us at 800-810-62885-Day Colourful Taiwan Group TourIf you like to take a round-island trip, Taiwan is the best place for you! You can climb A-li Mountain, go boating in Sun Moon Lake and experience the various cultures of the island.Tour Price:￥8500 Call us at 800-850-82888-Day London Private TourCome to London for a few relaxing days to enjoy the view of the Thames(泰晤士河) and visit such places of interest as Tower Bridge and Big Ben.Tour Price:1 person2-5 persons6-9 persons￥16800￥15800/person￥13800/personCall us at 800-830-72881. How long will the Yangzhou Colourful Group Tour last?A. Two days B. Four days C. Five days D. Eight days2.Mrs Li is planning to take the 4-Day Qingdao Private Tour with her two daughters. How much will they pay?A.￥1590 B.￥1650 C.￥2007 D.￥474003.If you want to take the 8-Day London Private Tour, you should call ________.A. 800-817-7223 B. 800-810-6288 C. 800-830-7288 D. 800-850-8288