大自然是我们绝好的课堂。当你和同学们漫步在绿树成荫、遍地青草的林间小路上，你会感觉到空气特别清新和湿润，此时你会想到这是绿色植物的什么作用改善了空气的质量？（    ）

材料一：

材料二：唐宋时期，南方农业发展超过北方，究其原因，南方战乱少，人口南迁，自然条件优越，农作物品种的改进等。

材料三：见下图

材料四：宋代时期，中外交往主要依靠海路，那时海外贸易兴盛，政府鼓励海外贸易，收入颇丰，以至于宋高宗说：“司舶之利最厚，若措施得宜，所得动以百万计。”

请回答：

—So it is. It's made _______ grapes, and they can be made _______ many other foods.

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