山西煤运到上海的最佳运输选择是（　　）

数百年前，我国黄土高原有茂密的森林．后来由于人口过于集中和长期掠夺式的开发等原因，变成了荒山秃岭．这个现象说明（    ）

读北半球某条河流上游水文站和下游水文站分别测得的径流量随着季节变化的曲线图，据图完成下列各题。

​

阅读短文，判断对错，对的写“正确”，错的写“错误”。

Hello, my name is Bob. I'm 10 years old. I'm from the USA. But I am in Beijing now. I like China. I can speak a little(讲一点点) Chinese. I have many friends at school. They are very friendly. I have lunch(午餐) at school. I can use chopsticks. I like Chinese food(食物). My favourite(最喜爱的) food is the Beijing Roast Duck(北京烤鸭).

狮子跳了5次，5×2=10，像狮子一样继续往前跳，并标出数．