完形填空 .从A、B、C、D四个选项中选出能填入空白处的最佳选项。
This is a family photo.Five1are in the photo,they are in a2.The boy is Barry Hand.3is a student.His school is in Puer.His parents are 4.Barry 5two sisters.One is Marry6the other is Mona.They are also students.Barry7math,and he likes sports.He8basketball every day.His sisters like9.It is a great language(语言). The Hand family has a phone. Its10is 773—1068.

若P为$△ABC$内一点，且$\overrightarrow{PB}+\overrightarrow{PC}+2\overrightarrow{PA}=\overrightarrow{0}$，在$△ABC$内随机撒一颗豆子，则此豆子落在$△PBC$内的概率为（   ）

一支燃着的蜡烛吹气，蜡烛熄灭；而同样对着一支点燃的蚊香吹气，为何就燃烧更旺？