B．gather the pollutants together

C．take the pollutants onto the bank

D．send a message to others

()4.According to the passage, which of the following statements is true?

A．The robotic fish have been used in ports as well as in the Thames.

B．It takes 24 hours for robotic fish to be recharged.

C．The robotic fish can work as a team without humans.

D．The robotic fish can not change direction in water.

()5.The passage mainly tells us about ________.

A．the robotic fish to smell out pollutants

B．a ￡2.5 million EU­funded project

C．researchers working on robotic fish

D．a 3D pollution map of the Thames

(二)

Plants have family values, too, it seems, with new research suggesting they can recognize close relatives in order to work together.

An ability to tell family from strangers is well known in animals, allowing them to cooperate and share resources, but plants may possess similar social skills, scientists believe.

Susan Dudley and Amanda File of McMaster University in Ontario, Canada, report they have demonstrated for the first time that plants can recognize their kin.

This suggests that plants, though lacking recognition and memory, are capable of complex social interactions.

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