在等差数列$\left\{a_n\right\}$中，$a_2+a_{12}=32$，则$2a_3+a_{15}$的值是（   ）

如图，M为⊙O上一点，弧MA=弧MB，MD⊥OA于D，ME⊥OB于E，求证：MD=ME．

小曲在学习聚落与环境的关系时，上网查到了下面的一副民居图片。根据民居和自然环境的关系，可以推断该民居可能位于（ ）

阅读短文回答问题

A: Could you tell me the way to the Sunshine School please?

B: Em, let me think about it.

A: I hope you can remind of it.

B: Yes, go down this street, then turn left at the third crossing（路口）, the Bus-stop is on your right, and you can take No. 10 bus to Sunshine School.

A: Wait...wait for a moment...I cannot catch it...Is it the first crossing?

B: No, the third crossing...

A: No. 10 Bus?

B: That's right. Are you clear?

A: Yes, clear. Thanks a lot.

B: You are welcome.