B．because they are used to swimming in the fresh water

　　C．because they can cough by means of their gills

　　D．because they are able to send e­mails by computers

　　答案：A　细节理解题。由第二段的第三、四句话“Bluegills are very sensitive to their environment. Changes in the environment cause their behavior and breathing patterns to change.”可知。

　　61．Which of the following statements about Bluegills is NOT true?

　　A．They are about the size of a human hand.

　　B．They are freshwater fish easily found in America.

　　C．They were used to safeguard water in the army.

　　D．They are smarter than any other living thing on earth.

　　答案：D　细节理解题。由第一段第一句话“...which are small enough to fit in your hand...”可知，A项正确；由第二段第二句话“They are common freshwater fish native to America and are also known as bream or sunfish.”可知，B项正确；由第二段第三句话“According to the Associated Press, the bluegills were originally used by the Army to make sure water was safe.”可知，C项正确；D项文中无根据，所以错误。

　　62．People decide whether the water is polluted by means of________.

　　A. information sent by the Army

　　B. the warning e­mail the computer sends

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