如图为某区域局部等高线地形图，读图回答下题．

补全对话

从方框中选择最佳选项完成对话，有两项多余

a. They are really loud.

b. On the left is the boy who plays the guitar.

c. I guess they play the blues.

d. Is this the band which is playing at the school dance?

e. When I am in a band, I want to play the guitar.

f. What are they doing?

g. That's great!

Lingling: This is a photo of the Blues Boys playing in a concert last month. They are really great.

Daming:____ 

Lingling: Yes, they play really great music.____ , and the boy in the front is the one who sings.

Tony: And at the back is the boy who plays the drums.____ 

Daming: What kind of music?

Tony: Well, if they are called the Blues Boys,____ and they get everyone dancing.

Daming: ____ 

Tony: You can play the guitar?

Daming: No, I can't. But I'd like to learn!

____

英国物理学家麦克斯韦认为：变化的磁场____（填“能”或“不能”）产生电场．已知电磁波在空气中的传播速度近似等于3.0×10⁸m/s，某广播电台的“经济、生活”节目的频率是1.0×10⁸HZ，该电磁波在空气中的波长为____ m．