秦岭一淮河一线是我国重要的地理分界线，下列叙述错误的是 （    ）

    Mrs. Green doesn't like sports. She has much work to do at home. Her mother is coming this afternoon and she goes to meet her. Near the school she looks at her watch. She has some time. So she goes into the school. Her son isn't in the classroom. She asks a boy and knows they're behind the school. She sees some boys playing there. Her son is there too. She watches them playing and soon she's angry. She takes her son to the wall. “Go home with me, Richard.” She says, "Don't play with them. I can buy a nice ball for you. Then you don't need to scramble for the ball."

①日本处于美苏两大势力圈的交点，战略地位重要

②中国恢复了在联合国的合法席位，遏制中国的国际影响

③蒋介石政权的垮台，打破了美国以中国为基地称霸亚洲的迷梦

④1950年朝鲜战争爆发，美国认为日本可以发挥防波堤的作用。