79. flood their fields or channel the water down parallel furrows

80. drip systems and new-energy sprinklers

81. played a leading role in feeding the world

第二卷

I. Translation

1. It usually takes us one week to recover from the flu.

2. How I miss the green mountain and the clear water in my hometown!

3. Due to the fact that they didn’t know English, the tourists were unaware of what their contracts were all about.

4. The shop owner tried to convince every customer that the plastic toys were available only in his shop.

5.Only short-sighted people will believe rumors on the Internet; thus making mistakes that they will regret in the rest of their lives.

II. Writing (略)