We won't think of human clones and any reason to suggest that we are closer to producing them today than we were yesterday. A . neither there is B . neither there was C . nor is there D . nor was there 答案:C
南方红豆杉为世界珍稀濒危物种,具有极其重要的药用和经济价值,虽可利用种了繁殖,但种子的休眠期长,种子的萌发率低,为挽救这一珍稀濒危物种,某校研究性学习小组围绕提前解除种子休眠提高发芽率这一目的,做了如下实验探索,通过实验得到了下表中的实验结果,请分析回答:
(1)
根据该小组的研究内容,请为他们的研究性课题拟订一课题名称:
________。
(2)
概括该小组实验过程的主要步骤:
①________;
②________;
③________;
(3)
该实验探究出的结论是:________。
(4)
为了使研究结果更加科学,更具有说服力,应作哪些方面的改进?________。