In the space provided, write the letter of the sentence that best expresses the implied main idea of each of the following paragraphs. _____ 1 Many people think there is no difference between an alligator and a crocodile. 2 However, the alligator's snout is shorter and broader than that of a crocodile. 3 A more dramatic difference between the two creatures lies in how dangerous they are to humans. 4 There are very few documented instances in which alligators have killed a person. 5 On the other hand, crocodiles, particularly those along the Nile River, are quite dangerous to humans. 6 It is said, in fact, that as far as killing people is concerned, crocodiles are second only to poisonous snakes.