【正文】
the heaviest in the class. 5 I am luckier than you are. I am the luckiest in the class. 6 I am fatter than you are. I am the fattest in the class. 7 I am thinner than you are. I am the thinnest in the class. 8 I am bigger than you are. I am the biggest in the class. C 1 But that street is cleaner. It is the cleanest street I have ever seen. 2 But that man is older. He is the oldest man I have ever seen. 3 But that river is longer. It is the longest river I have ever seen. 4 But that woman is shorter. She is the shortest woman I have ever seen. 5 But that knife is blunter. It is the bluntest knife I have ever seen. 6 But that car is cheaper. It is the cheapest car I have ever seen.