答案解析:答案为A。本题为推理题。由倒数第二段第一句话 “…but the lack of available panda eggs could be a major problem”可知,C选项错误。由该段第二句话 “They will probably have to do several hundred transfers to result in one pregnancy (having a baby).”可知,B选项错误。由该段第三句话 “It takes a long time and it's difficult, but this could be groundbreaking science if it works.”可知,这(细胞核移植需要很长时间,而且难度很大,但是一旦成功,便会成为开创性的科学。If certain species should become extinct, …there would be enough of the basic building blocks to reintroduce the species in the future.”,而 D选项 “如果物种灭绝,基础建设材料基础建设材料. The best title for the passage may be_________.
A. China's Success in Pandas Cloning
B. Helping Ways to Avoid Extinction
C. Exploring the Possibility to Clone Pandas
D. The Practice in Noah's Ark
答案解析:答案为C。本文为资讯报导类文章濒临灭绝从第二段起具体介绍Duane Kraemer对中国科学家克隆大熊猫的做法的评价,并与美国科学家正在从事的诺亚方舟做了对比。文章最后一段表达了他们对中国同行所做的工作的高度评价探索克隆大熊猫的可能性. From the passage we know that_______.
A. Kraemer and his team have succeeded in cloning a panda
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