3.Although at present human egg cells and embryos needed for cloning research are difficult to obtain, newspapers wrote of evil leaders hoping to clone themselves to attain their ambitions.

尽管目前供克隆研究的人类卵细胞和胚胎很难获得，报纸上报道说，有些邪恶的头目希望把自己克隆出来以实现他们的野心。 在"主语＋be＋某些形容词＋不定式"结构中常用不定式的主动形式表示被动意义。 A man who is so difficult to please must_be_hard_to_work_with.

一个很难取悦的人一定很难与之共事。 4.However, scientists still wonder whether cloning will help or harm us and where it is leading us.

然而，科学家们仍对克隆技术有助于人类还是有害于人类，以及克隆技术将把我们引向何方感到困惑。 wonder whether/if ..."想知道......"。 I am wondering_if you could tell me more about this activity.(2015·重庆满分作文)

我想知道你是否能告诉我有关这项活动更多的信息。 　　

　　1．(教材P10)Think about how they differ.

　　想一想他们如何不同。

　　differ vi.不同；相异

　　(1)differ from (＝be different from)

　　　　　　　　　　　　 与......不同

　　differ in (＝be different in) 在......方面不同

　　differ with sb. on/about/over sth.

　　 与某人在某事上意见不同

　　(2)different adj. 不同的；有差别的

　　difference n. 区别；差异

　　make a difference (to ...) 对......有作用或影响；对......重要

　　make no difference (to ...) 对......没有影响

　　tell the difference between A and B

　　 指出A与B的不同

　　①She differs from her sister in the colour of her eyes.

　　她眼睛的颜色与姐姐的不同。

　　②We differ with each other about the standard.

　　我们之间关于这个标准有不同的看法。

　　③We know of different (differ) cultures by learning English.

通过学习英语，我们理解了不同的文化。