4．Which is the best title for this passage?

　　A．Reduce your water bill with a rain barrel.

　　B．Try to save more water for future generations.

　　C．How to maintain a garden of your own economically.

　　D．Rain barrels for good environments—do it yourself!

　　解析：标题判断题。本文主要介绍了用水桶接雨水用于日常生活可以节省水费。

　　答案：A

　　B

　　The olive is one of the oldest planted crops known to man and is still widely grown in the Mediterranean.An olive tree can have a life of 500 years and is strong enough to continue to grow if ever chopped to the ground.It takes up four years before the olive tree is ripe enough to bear fruit.

　　Olive trees originated in the Mediterranean region where there is the perfect climate for the olive tree planting.It is characterized by abundant sunshine year­round and hot，dry summers with an average temperature of 80°F.In winter，it rarely drops below 50°F.Olive trees were first planted by humans around 4000 BC in an area known as the Fertile Crescent.Before the areas became desert，countries such as modern­day Turkey and Iraq had a lush environment with soil that plants grow well.Archaeological findings suggest that farming began in the Fertile Crescent before 7000 BC.Instead of living as hunter­gatherers，these early humans settled down and harvested native plants.They selected olive trees that produced larger and oilier olives than the wild trees.

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