C. call on people to pay attention to their daily diets

　　D. introduce a lively debate to amuse the reader

　　[解析]　写作目的题。作者的目的是通过介绍试验”低热量的饮食可能会延长人的寿命”，呼吁人们注意控制饮食。

　　[答案]　C

　　[长难句解读]　Another expert noted that, despite some highly publicized studies in certain species, the link between restricted eating and longer lifespan has been far from proven.

　　本句的主句为Another expert noted that，其中that引导的是一个宾语从句。从句用despite表示让步关系，后面的far from proven意为”远没有得到证明”。

　　The treadle pump is based on a design developed in the 1970s by Norwegian engineer Gunnar Barnes. It can be made locally.

　　The treadle pump is easy to build from bamboo or other wood and two metal cylinders (圆筒) with pistons (活塞). The pistons go up and down as a person stands on lever devices — treadles — and uses a natural walking motion.

　　How many hours a day the pump needs to be operated depends on the season and how much water is needed for crops. It could be two hours a day. It could be seven hours a day.

　　Small children sometimes stand with their parents on the treadles. Everyone in the family can take turns operating the pump.

　　The Acumen Fund is a nonprofit group that invests in business projects to fight poverty. It studied the effects of treadle pumps in the Indian state of Uttar Pradesh. Uttar Pradesh has three treadle pump manufacturers and more than seventythree thousand pumps.

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