若向量$\overrightarrow{a}$，$\overrightarrow{b}$满足|$\overrightarrow{a}$|=1，|$\overrightarrow{b}$|=2且|2$\overrightarrow{a}$+$\overrightarrow{b}$|=2$\sqrt{3}$，则向量$\overrightarrow{a}$，$\overrightarrow{b}$的夹角为（　　）

官员质问某人：“这些是你的书吗？你会撤销你的主张吗？”这人坚持：“我只接受《圣经》的权威和自己良心的约束；我不能撤回我写的任何东西，因为我的良心是跟随着《圣经》的，而昧着良心做事既不稳妥，也不正确。”这应是下列哪两人的对话（    ）

    If you want to travel to a new place, what will you worry about first? The answer may be how to1the way.

    In big cities many people go from one place to2by bus, taxi or underground. The bus is a popular3of travelling.  If you want to use a bus  you should (应该） know4bus to take. You should5the timetable (时间表) right so that you can take the6bus and get to your place on time. And it's important for you to know7to get off.

    In the countryside (农村), 8can be much simpler (简单). In some places with small roads, people get to school or their offices by9. In my hometown we usually take a boat to school. In other places, students can go to school10foot because they live near the school.