“Plants have this kind of hidden but complicated social life，” Dudley said.

The study found plants from the same species of beach­dwelling wildflower grew aggressively alongside unrelated neighbors but were less competitive when they shared soil with their families.

Sea rocket, a North American species, showed stronger and healthier root growth when planted in pots with strangers than when raised with relatives from the same maternal(母系的) family, the study found.

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

A．Animals can recognize and memory 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 not useful at all.

()3.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

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

A．Sea rocket is a South American species

B．Sea rocket grows aggressively alongside unrelated neighbors

C．Sea rocket grows aggressively alongside its siblings

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