托福注意不要与动词cross弄混：(1) 表示“穿过”时的用法比较：It's dangerous for an old man to cross such a crowded street. 老人穿过这样拥挤的街道很危险。It's dangerous for an old man to walk across such a crowded street. 老人穿过这样拥挤的街道很危险。(2) 表示
