Genetic maximums can change, but don’t expect this to happen soon. Claire C. Gordon, senior anthropologist at the Army Research Center in Natick, Mass., ensures that 90 percent of the uniforms and workstations fit recruits without alteration. She says that, unlike those for basketball, the length of military uniforms has not changed for some time. And if you need to predict human height in the near future to design a piece of equipment, Gordon says that by and large, “you could use today’s data and feel fairly confident.”

　　31. Wilt Chamberlain is cited as an example to

　　[A] illustrate the change of height of NBA players.

　　[B] show the popularity of NBA players in the U.S..

　　[C] compare different generations of NBA players.

　　[D] assess the achievements of famous NBA players.

　　32. Which of the following plays a key role in body growth according to the text?

　　[A] Genetic modification.

　　[B] Natural environment.

　　[C] Living standards.

　　[D] Daily exercise.

　　33. On which of the following statements would the author most probably agree?

　　[A] Non-Americans add to the average height of the nation.

　　[B] Human height is conditioned by the upright posture.