答案：D

　　2.An electrical engineer from the University of Pretoria has developed .

　　A.a protective net

　　B.a new shark­repellent system

　　C.the electric field

　　D.an insulated cable

　　解析：细节理解题。根据“An electrical engineer from the University of Pretoria has

　　developed an electrical system that repels sharks by controlling their movements.”及下文的“shark repellent method”可知答案。

　　答案：B

　　3.An electric field is produced in the water above the cable .

　　A.only when the shark swims into the electric field

　　B.an insulated cable is buried on the bottom of the sea around a beach from which people swim

　　C.only when an electric current is sent through the cable

　　D.only when the sharks are trapped in protective nets

　　解析：细节推断题。根据“When an electric current is sent through the cable，an electric field is produced in the water above the cable.”可知。

　　答案：C

　　4.Which of the following is NOT true according to the passage？

　　A.Protective nets had been installed around the beach earlier than the new shark repellent system.

　　B.This new kind of shark repellent system will take place of the protective nets.

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