_________（50）A.disappearing into the water below.
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_________（50）
A.disappearing into the water below.
B.Why is it,then,that most people survive attacks by great whites?
C.they most often move in slowly and bite less hard.
D.There is reason to doubt that great whites see well enough to attack humans.
E.It has been thought that they mistake people for the seals or sea lions which make up a large part of their diet.
F.He looked down and was terrified to see a great white shark biting the front of his board.
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答案：C
“C.they most often move in slowly and bite less hard.”结合空格句的前一句，意思是：“当大白鲨在攻击海豹时，他们会迅速窜上海面，用力撕咬。但当大白鲨在攻击人类时，它们在大多数情况下会慢慢浮上海面，撕咬的力度也轻得多。”