Learning and memory appear to be important for kin recognition in animals, but this isn’t an option for plants, she noted.

　　Some researchers speculate(猜测) that plants communicate through their roots, identifying themselves using tiny chemical signatures specific to each plant’s family.

　　()6.What’s the main idea of the message?

　　A．Studies find plants can recognize, communicate with relatives.

　　B．Kin selection is important for plants.

　　C．Animals can recognize and memorize their relatives.

　　D．Competition asks plants to recognize their relatives.

　　()7.Which of the following is NOT right about animals’ social skill?

　　A．Animals can recognize and memorize their relatives.

　　B．Animals’ social skill is to cooperate and share resources.

　　C．Animals’ social skill can recognize close relatives in order to work together.

　　D．Animals’ social skill is no use at all.

　　()8.Plants’ kin selection is to ________.

　　A．grow well

　　B．compete with other kinds of plants

　　C．strengthen the relationship among siblings

　　D．find which one is the best

　　()9.From the passage，we learn that ________.

　　A．sea rocket is a South American species

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