2 . 袁隆平毕生致力于水稻生产。（汉译英）

3 . 用方框中单词的适当形式完成下列句子，每个单词只能用一次。

graduate   contribute   produce   science   demand   recycle   occasional

1. I have so many great memories, but one particular occasion is the day of my ________ .
2. Climbing is physically ________ .
3. Einstein was awarded the Nobel Prize for his ________ to Quantum Theory.
4. ________ we go out to restaurants, but mostly we eat at home.
5. Plastic bottles can be ________ into clothing.
6. The country is totally self-sufficient in food ________.
7. If you do something in a ________ way, you do it carefully and thoroughly, using experiments or tests.

4 . 公司在放缓生产，以保持供需之间的平衡。(maintain a balance) (汉译英)