DNA彻底水解后可得到的物质是[     ]

A．氨基酸

B．氨基酸和脱氧核苷酸

C．二氧化碳、水和含N废物

D．脱氧核糖、含N碱基和磷酸

用所给单词的适当形式填空。

1.I am going to _______ (learn) music next year.

2.He _______ (teach) us English last term.

3.Don't _______ (throw) the stone at me.

4.Christmas is very important in _______ (west) countries.

5.I forget _______ (bring) this book for you. Here you are!