3.That is why today over 40% of Californians speak Spanish as a first or second language.

那就是今天超过40%的加利福尼亚人仍然把西班牙语作为第一或第二语言的原因。 That is why ..."那就是......的原因"。 He is addicted to computer games, and that_is_why he has to drop out of school.

他迷恋电脑游戏，那就是他不得不辍学的原因。 4.It is believed that before long the mix of nationalities will be so great that there will be no distinct major racial or cultural groups, but simply a mixture of many races and cultures.

人们认为，要不了多久，多种国籍的混合将会非常之大，以至于不可能存在一种明显主要的种族或文化群体，而只是多种族、多文化的混合体。 It is believed that ..."人们认为/相信......"，其构成为：It＋be＋过去分词＋that从句。 It_is_believed_that working hard can lead to success.

人们相信努力工作就能成功。 　　

　　1．(教材P1)The customs and languages of the immigrants live on in their new home.

　　这些移民的风俗习惯及语言在他们的新家都得以延续。

　　live on

　　(1)继续生存；继续存在(on为副词)

　　①He died ten years ago, but his memory lives on.

　　他十年前就去世了，但他仍然活在人们的记忆中。

　　(2)靠......生活；以......为生；(人)以......为食(on为介词)

　　②The whale does not live_on_small_fish.

　　这种鲸鱼并不以小鱼为食。

　　live up to　　　　　　　 符合；不辜负；履行

　　live through 经历过

　　live by doing 靠......为生

　　③He hosted the Academy Awards again this year, and his talks always live_up_to the expectation of most audience.

　　他今年又一次主持了奥斯卡颁奖典礼，他的语言总能满足大部分观众的期望。

　　④The old man lives by selling newspapers every day.

　　这位老人每天靠卖报纸谋生。

2．(教材P2)Scientists believe that these settlers crossed the Bering Strait in the Arctic to