任何一个区域内，自然环境各要素都是相互联系的，同时影响着当地的人文环境，该甲、乙、丙、丁四个区域的示意图，完成以下小题．

完形填空。

     Jean is an English girl. She lives in Beijing 1 her parents. She doesn't know Chinese very 2. But she 3 very hard. She often speaks 4 in class and after class. Sometimes her classmates don't understand her 5 she can't speak Chinese well.

    It's Sunday morning. Jean wants to 6 some flowers, but she doesn't know the 7 to the flower shop. She asks a Chinese boy for help. The boy can't 8 her. Then she takes out a pen and a piece of paper and draws a 9 of a shop and some flowers. The boy looks at it and then 10 her the way.

下列各组物理量中，全部是矢量的有（   ）

—I want to buy the book Harry Potter. Do you know its ________?

—Not quite sure. Maybe 30 yuan.

在公众场所，一个人吸烟，其他人都会“被动吸烟”，这是因为（    ）