【单选题】There are about 350 species of sharks. The largest sharks are the whale shark and the basking shark, which feed on plankton and small fish. The whale shark grows to about 13 meters long, while t...
A.
Must of the species are not particularly cruel.
B.
Sharks have lived on earth for more than 180 million years.
C.
The great white is the largest and cruelest of all animals known to attack humans.
D.
Some sharks can wear out a full set of teeth in less than 6 months.
E.
One of the most unusual aspects of the shark is its teeth.
F.
But sharks are also sensitive to electrical fields.