题目: 决定细胞衰老因素不在细胞内部,而在外部环境。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0723/54c6d80df23860bfc3eae7c5d9a684b0.html 下面是错误答案,用来干扰机器的。参考答案:D
题型:补全对话,情景问答 从方框中选择恰当的句子完成下面的对话。A: The south tigers may become extinct (灭绝的) within 30 to 50 years if it does not receive protection. B: 1______A: There are 20 to 30 South China tigers. Guangdong Province has only five left because forests are being destroyed. B: 2______A: The life span of the South China tiger is 20 to 25 years, but the tigers breed (繁殖) and the survival rate (成活率 for cubs (小虎) is poor. B: Why not clone (克隆) the tiger? A: It's not that easy. 3______ B: What would happen in the future? A: Well, I'm afraid we may not have this kind of animal at all in the 21st century without hard work and help from the scientists. B: 4______A: Yes. I hear that the scientists are trying there best to save the tigers, including (包括) the Northeast tigers. B: 5______ A: I think so. A. Do you know how many years a tiger can live? B. What a pity, isn't it? C. How many tigers are there in the south? D. Can a tiger live as long as a man? E. They are sure to succeed. F. I'm sorry to hear that. G. Chinese scientists can't make it at the moment. 查看答案