C．They started eating more.

D．Other animals started working with them.

第5部分：补全短文(第46～50题，每题2分，共10分) 下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。

46、根据材料，完成46-51题。

The Tough Grass that Sweetens Our Lives

Sugar cane was once a wild grass that grew in New Guinea and was used by local people for roofing their houses and fencing their gardens. Gradually a different variety evolved which contained sucrose (蔗糖 ) and was chewed on for its sweet taste. Over time, sugar cane became a highly valuable commercial, plant, grown throughout the world.

(46)Sugar became a vital ingredient in all kinds of things, from confectionery (糖果点心) to medicine, and, as the demand for sugar grew, the industry became larger and more profitable.

(47) Many crops withered (枯萎) and died, despite growers attempts to save them, and there were fears that the health of the plant would continue to deteriorate.

In the 1960s, scientists working in Barbados looked for ways to make the commercial species stronger and more able to resist disease. They experimented with breeding programmes,mixing genes from the more delicate, commercial type.

(48) This sugar cane is not yet ready to be sold commercially, but when this happens, it is expected to be incredible profitable for the industry.

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