Question

(a)

Part A
In paragraph 2, how does the author help the reader understand how ultrasound works?   

A

by describing the features of new technology

B

by using familiar concepts to explain new technology

C

by explaining how researchers discovered new technology

D

by providing additional resources about the new technology

(b)

  
Part B
Which sentence from paragraph 2 best supports the answer to Part A?   

A

"At that moment, you are standing in a cylinder of sound."

B

"Whereas a loudspeaker broadcasts sound in all directions, the way a lightbulb radiates light, a directional speaker shines a beam of waves akin to a spotlight."

C

"The beam consists of ultrasound waves, which humans cannot hear, but which can emit audible tones as they interact with air."

D

"By describing these interactions mathematically, engineers can coax a beam to exude voice, music or any other sound."

Answer 1

(a) The best answer for Part A is:

**B** by using familiar concepts to explain new technology.

(b) The sentence from paragraph 2 that best supports the answer to Part A is:

**B** "Whereas a loudspeaker broadcasts sound in all directions, the way a lightbulb radiates light, a directional speaker shines a beam of waves akin to a spotlight."

This sentence compares the functioning of ultrasound technology to a familiar concept (the loudspeaker), which helps the reader understand how ultrasound works.