D．because

　　19. A．left

　　B．designedlooked

　　D．watchedonto

　　24. A．at

　　B．through

　　C．inside

　　D．over

　　25. A．happily

　　B．frightenedly

　　C．calmly

　　D．angrily

　　26. A．opened

　　B．lockedB．climb

　　C．rush

　　D．dive

　　29. A．hoped

　　B．wished

　　C．expected

　　D．supposed

　　30. A．later

　　B．earlier

　　C．slowly

　　D．quickly阅读理解some concerns have been raised about the health of the world's banana plants. A number of media reports have said that bananas may completely disappear. Some claim that this could happen in as little as ten years.

　　Bananas are one of the world's most important food crops. They are also the fourth most valuable export. Bananas do not grow from seeds. Instead, they grow from existing plants. Bananas are threatened by disease because all the plants on a farm are copies of each other. They all share the same genetic weaknesses.

　　For example, the Cavendish banana is most popular in American markets. It is an important export crop. However, some kinds of fungus organisms(有机体)easily infect the Cavendish. Black Sigatoka disease affects the leaves of Cavendish banana plants. The disease is controlled on large farms by putting chemicals on the plant's leaves. Farmers put anti­fungal(抗真菌的) chemicals on their crops up to once a week.

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