1. * chemists to develop insecticides to kill the adult mosquito and its young, and researchers to develop drugs to treat malaria sufferers;
    * 化学家开发杀虫剂来消灭蚊子的成虫和幼虫，研究人员开发药品来治疗疟疾患者；

2. Birds are creatures which fly.
    鸟是会飞的动物。

3. Birds learn to fly by instinct.
    鸟会飞是出自本能.

4. Birds have the power to fly.
    鸟能飞。

5. But none of them has been turned to stone yet!
    但到目前为止还没有一个变成石头呢！

6. But most of all, he sunk his dishonest gains into this village that captured his heart with its fine stone cottages, its central area of green grass, green rows of hedges, and its fantastic view of rolling fields and pine forests disappearing into th
    但是最主要的，是他将不法收入投进了这座山村。精致的石屋农舍，茵茵的村中绿地，一排排青青的树篱，以及绵延起伏的原野与松林，像古代行进的士兵渐渐消失于远方的地平线上——这一派奇异的景色深深地吸引了他。

7. We owe a lot to the birds and beasts who eat insects.
    我们十分感激食虫的飞禽和走兽.

8. We eat the flesh of animals , birds , and fish.
    我们吃兽类、禽类和鱼类的肉。

9. Wood and stone are building materials.
    木材和石头是建筑材料。

10. When farmer spray poison to kill plant pests, poison is sent into the air the water and the soil.
    农民为了杀死害虫而喷撒农药的时候,有毒物就被排放到空气中, 水里和土壤里.

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