Q1 What is the author's purpose for repeating the phrase "What next?" throughout the article? to assure readers that Edison plans to invent more things

to explain what Edison said when asked to talk into a machine to record his voice

to convey that Edison wants to know what else he might see on his tour of the plant

to show that Edison's early inventions led to new discoveries by him and other inventors

Q2 How does dividing the article into sections help the author develop the article's ideas?

It unifies each part and focuses attention on one topic at a time.

It adds details for each subtopic in the proper order.

It provides an understanding of how events occurred in sequence.

It distinguishes between relevant and irrelevant details.

Q3 What does "mercury boiler" mean in the last paragraph?

a mechanism that provides radiant heating to homes during cold winter months

a system that uses water and mercury to generate steam for engines

a metal that is melted down when subjected to extreme heat

a type of container used during experiments with mercury

Q4How does the use of the word pallo-photophone in Paragraph 2 affect this passage?

It implies that the passage is intended for people with an interest in electricity.

It helps readers understand the science behind motion pictures with sound.

It implies that there was an early version of telephone technology.

It helps readers understand the technology behind photography.