Test 6D 阅读理解Electric eel:It is a South American fish.Electric eels are long,and generallygray-brown in color.The electric eel can reach up to 9 feet long and can weigh up to22 kg.These fish have a mouth rich in blood vessels(血管)that can be used as lungs.The tail has the electric organ and that discharges(释放)300-650 volts of electricity.电鳗：它是一种南美洲的鱼类。电鳗很长，颜色一般为灰褐色。电鳗可以达到 9 英尺长，它的体重可以达到 22 千克。这种鱼的嘴里有着丰富的血管，可以作为肺部使用。电鳗的尾部有发电器官，可以释放 300-650 伏的电流。
