下列叙述正确的是 （   ）

 $C_7^4$+$C_7^5$+$C_8^6$等于（　　）

如图所示电路，电源电压为6V，开关闭合后电压表的示数为2.8V，则灯L₁两端的电压为____ V，灯L₂两端的电压为____ V．

   At school I have a good friend. He is an English boy. His name is Tom. He is twelve. We are in No. 10 Middle School. We're not in the same class. He is in Class 4, Grade 1. I'm in Class 2, Grade 1. Tom's sister is not a student. Her name is Jane. She is five. She is a nice girl. 
Miss Gao is my English teacher. She is thirty. Mr Wang is Tom's Chinese teacher. He is thirty, too. They're good teachers. 
根据短文内容, 判断下列句子正(T)误(F)。