請依下文回答第 46 題至第 50 題
     The Australian crocodile is the largest crocodile in the world. It can grow up to seven meters long, and the biggestcan weigh up to 1,000 kilometers. It has only two muscles to open its mouth but 40 to close it! What makes crocodilesso dangerous is that they attack extremely quickly, and they take their victims under the water to drown them. Theyusually attack in the water, but they can suddenly come out of a river and attack animals or people. And they can run onland as fast as 17 kilometers per hour.
     Every year in Australia there are crocodile attacks on humans. Two years ago a 24-year-old German tourist diedwhen she went for a swim in a lake. Although there were signs warning people that there might be crocodiles, the womanand her friends decided to go for a midnight swim. The woman suddenly disappeared, and the next morning her bodywas found. Near it was a four-meter long crocodile. And only last month two Australian boys watched in horror as theirfriend was killed by a crocodile when they were washing their bikes in a river. They climbed a tree and stayed there for 22 hours while the crocodile waited below.
      But you can survive a crocodile attack. Last year Norman Pascoe, a 19-year-old, was saved from a crocodile whenhis aunt hit it on the nose. Norman’s aunt said: “I hit it and I shouted, ‘Help!’ The crocodile suddenly opened its mouthand my nephew escaped.”
46 Which of the following statements about Australian crocodiles is true?
(A) They have more muscles to open their mouths than to close them.
(B) The average weight of Australian crocodiles is 1,000 kilometers.
(C) They only attack animals or people in the water.
(D) They are bigger than all other kinds.