关于杭州市区的说法，正确说法有几个？（    ）

①钱塘江穿杭州城而过②一月平均气温在零摄氏度以下③市区地形主要以平原和高原为主④位于秦岭---淮河以南⑤位于我国第一级阶梯上⑥杭州降水不多，较干燥，不属于湿润地区

如图，在一笔直的海岸线l上有A、B两个码头，A在B的正东方向，一艘小船从A码头沿它的北偏西60°的方向行驶了20海里到达点P处，此时从B码头测得小船在它的北偏东45°的方向．求此时小船到B码头的距离（即BP的长）和A、B两个码头间的距离（结果都保留根号）．

增加：在缺词处加一个漏字符号（∧）, 并在其下写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线, 并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处, 多者（从第11处起）不计分。

    Jack lives in a smaller town in England. He usually stayed in his own country during the holidays. Last year, he decided to go to Russia and stayed there for a few day. One day, he went out for walk. In England, people drive on the left side of the road. And in Russia, they drive on the right, which Jack forgot. When crossed a busy street, she was almost knocked down by a car. Jack stood here for a moment, full of fear. Shortly after he recovered from himself, he said: “Where am I?” An old man which sold maps nearby ran to Jack at once and said: “Maps of the city, sir?”