读图，有关我国西高东低阶梯地势的有利影响，下列叙述错误的是（    ）

       American schools begin in September after a long summer holiday. There're two terms in a school year. The first term is from September to January, and the second term is from February to June. Most American children begin to go to school when they're five years old. Most students are seventeen or eighteen years old when they finish high school.
      High school students take only five or six subjects each term. They usually go to the same classes every day, and they have homework for every class. After class, they do a lot of interesting things.
     After high school, many students go to college(大学). They usually have to pay a lot of money. So, many college students work after class to get money for their studies.

目前，大多数人类学家认为，现代人类可能是从非洲南方古猿的一支发展而来的。那么，促使古猿向人进化的主要因素是（   ）

依次填入下列各句横线处最恰当的一组词语是（      ）
（1）外交部长李肇星专门指示邓清波总领事要尽一切力量，尽快          中国遇难者身份。
（2）深圳市鼓励有条件的企业对          员工实行内部退养。
（3）美国白宫10日反驳了民主党领导人           布什在越南战争时期曾“擅离职守”的指责。