设{an}是等差数列，a1+a3+a5=9，a6=9，则这个数列的前6项和等于[ ]
A.12
B.24
C.36
D.48
答案：B
Go to the teacher's office. the homework.[ ]
A. Hang up
B. Hand
C. Hand in
欺骗误导消费者的医疗器械广告主要有哪些表现形式？
