A key part of the training program is teaching these mammals how to stop potentially unfriendly swimmers. The program is also positioned to defend against swimmer terrorist attacks as well.

　　In the digital age, it seems that there should be more advanced approaches to guard the Navy’s most expensive things. But according to Rothe, the program director, nothing in today’s high-technology world can compete with these mammals’ biosonar abilities. “I hope that one day there is a robot or a UUV (un-manned underwater vehicle) that makes the mammal program out of date,” he said. “But right now this is the best thing out there.”

　　32. The U.S. Marine Mammal Program trained marine mammals to ______.

　　A. stop dangerous swimmers

　　B. catch 20 pounds of fish a day

　　C. destroy sea mines

　　D. fire torpedoes

　　33. The U.S. trained dolphins because they ______.

　　A. are clever

　　B. swim very fast

　　C. have natural biosonar

　　D. have good underwater eyesight

　　34. What can we learn from the last paragraph?

　　A. The trained dolphins are the best way of protection available to the U.S. Navy.

　　B. There will be dolphin-like robots in the future according to Rothe.

　　C. The mammal program will become useless soon.

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