在分层设色地形图上，一般绿色表示____；黄色、褐色表示____；白色表示雪山冰川；蓝色表示____。

乘数效应是一种宏观经济效应，是指经济活动中某一变量的增减所引起的经济总量变化的连锁反应程度。“乘数效应”体现的哲学道理有(       )

①事物之间的相互联系构成事物的变化和发展 

②自在事物的联系是客观的

③事物之间的联系是具体的、有条件的    

④量变是质变发展的必然结果

    Traditionally, across the world, boys and girls attend a mixed school, where they study together. But boys' schools are the perfect place to teach young men to express their emotions (情感) and encourage them to take part in activities such as art, dance and music.

    Boys at single-sex schools were said to be more likely to take part in cultural and artistic activities that helped develop their emotional expressiveness, rather than feeling they had to correspond to(和…相符) the "boy code" of hiding their emotions to be a "real man".

    The findings of the study go against accepted wisdom that boys do better when taught together with girls.

    Tony Little, head master of Eton, warned that boys were being failed by the British education system because it had become too focused on girls. He criticized teachers for failing to recognize that boys are actually more emotional than girls.

    The research argued that boys often perform badly in mixed schools because they become discouraged when girls do better earlier in speaking and reading skills.

    But in single-sex schools teachers can tailor (量身定做) lessons to boys' learning style, letting them move around the classroom and getting them to compete in teams to prevent boredom, wrote the study's author, Abigail James, of the University of Virginia.

    Teachers could encourage boys to enjoy reading and writing with "boy-focused" approaches such as themes and characters that appeal to them. Because boys generally have more acute vision, learn best through touch, and are physically more active, they need to be given "hands-on" lessons where they are allowed to walk around. "Boys in mixed schools view classical music as feminine（女性的） and prefer the modern genre （类型） in which violence and sexism are major themes," James wrote.

    Single-sex education also made it less likely that boys would feel that they had to be "masterful and in charge" in relationships. "In mixed schools, boys feel forced to act like men before they understand themselves well enough to know what that means," the study reported.