题目

离体的植物组织或细胞在适当培养条件下发育成完整的植株，离体动物体细胞却没有发育成动物的成熟个体，原因是（ ） A．动物细胞内没有成套的遗传物质 B．动物细胞的全能性随分化程度提高而受到限制，分化潜能变弱 C．动物细胞的细胞核太小 D．动物细胞的全能性低于植物细胞 答案：解：动物细胞的全能性随分化而受限变弱，只能通过核移植实现克隆动物的目的；动物体细胞克隆：将供体体细胞核与受体去核卵细胞的细胞质进行人工组合，借助于卵细胞的发育能力，经培养发育成胚胎进而形成个体的技术． 故选：B．A. Liu Xiang teaches quake students hurdling     Chinese hurdler Liu Xiang Monday visited students in a primary school in Bei Chuan County, a hard-hit area in last year's devastating May 12 earthquake, and showed them how to run hurdles.B. Experts: 3G still has a long way to go     While China's three leading telecom operators are playing up the third generation (3G) telecom technologies, it is likely to take years for 3G services to become popular in China.C. China table tennis team swept all 5 golden medalsYesterday China team swept all 5 golden medals at World Table Tennis Championships in Yokohama. Beside these 5  golds, China also gain all 5 silver medals and other 8 bronze medals. The 2 rest bronzed medals are respectively won by Japan and China Hong Kong.D. Sleeping too much or too little increases your risk of DiabetesMiddle-aged or old people who get too little sleep, or too much, are far more likely to develop diabetes, says scientists. A study has found that those who did not enjoy the optimum level of seven to eight hours sleep a night were two and a half times more likely to develop a blood sugar abnormality linked to type 2 diabetes.   E. Obama seeks to block release of abuse photosUS President Barack Obama declared Wednesday he would try to block the court-ordered release of photos showing US troops abusing prisoners, abruptly reversing his position out of concern that the pictures would “further inflame anti-American opinion” and endanger US forces in Iraq and Afghanistan.F. Prospects of flu outbreak remain unclearUS public health expert Laurie A. Garrett said Wednesday that how serious the A(H1N1) influenza situation is going to develop remains unclear. A Washington state man with H1N1 influenza died last week, health officials said, the third U.S. sufferer to die as the new flu strain confirmed in more than 2,200 Americans appeared in Japan and Australia.以下是人物信息，请从上述A-F选项中匹配适合他们阅读的新闻：56. Liu Ming works as a chairman of a local Ping Pong club in Fo Shan. He shows great concern for sports news especially the news about Ping Pong. He has never missed a single Ping Pang match of China Ping Pang Team.57. Han Yiwei is a successful CEO of a big International Company in Guangzhou. He usually flies to other countries for business, so he would like to equip himself with the most advanced communication appliances and know the news concerning the development in the communication area.58. Han Lei is an18--year--old girl, studying in a High School. She is a sports enthusiast and is good at tennis and jumping. Besides, she has a particular interest in those sports celebrities. 59. Chen Lirong just retired from a state enterprise, living with his husband, who is retired too. They want to arrange their life without work in a better way and enjoy the life with a healthy body and high spirits. So she particularly pays more attention to their health.60. Li Hongyu studies in China Foreign Affairs University, majoring in International Relationship, and especially he shows great concern for the relationship between America and the Middle East countries.