In the end，plants’ ability to communicate their needs—and our ability to understand them—could help farmers reduce the use of poisonous chemicals，cut operating costs and limit damage to the environment.

　　5．The recent scientific studies have shown that plants can________.

　　A．communicate with other living things in a chemical way

　　B．hardly react to any sudden change in temperature

　　C．use a very special chemical language which is familiar to us

　　D．respond to the attack by giving off poisonous chemicals

　　6．When being eaten by an insect，the plant will________.

　　A．walk away from trouble

　　B．change its chemistry to kill the insect

　　C．release a chemical vapor to “ask” other plants for help

　　D．give off nice chemicals to attract friendly insects killing the pest

　　7．The underlined word “alert” most probably means “________”．

　　A．warn

　　B．protect

　　C．threaten

　　D．allow

　　8．Which would be the best title for the passage?

　　A．Communication between Plants

　　B．A Chemical “Language”

　　C．Plants Can Talk

　　D．How Plants Protect Themselves

　　详解答案

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