5. ... is often followed by ...

　　 ☆词汇短语☆

4. One of the reasons why ... is ...

3. What happened first was that ...

2. The nutrients is whatever falls into the ocean will

　　 quickly become available to other living things.

1. What is it that makes the ocean such a great place to

　 live?

13. call in 召集

　　 ☆交际用语☆

12. at first sight 乍一看

11. regardless of 不顾

10. start with 以……开始

9. from then on 从那时起