Question

lasers: the light fantastic!
six decades later, lasers have become a vital part of scientific research, industry, medicine, and even daily life.
the steam engine powers a revolution
with the steam engine, industry had found a ubiquitous source of unparalleled power.

• choose the correct answer -

1 negative best described as
hesitant
excited
significant

Explanation:

The question likely asks about the tone or description of the statements about lasers and the steam engine. The words "vital", "ubiquitous", "unparalleled" suggest a positive view, but the options include "significant" which fits as the impact of lasers and steam engine is significant. "Negative" is opposite, "hesitant" implies doubt, "excited" is more emotional. So "significant" best describes their impact.

Answer:

1. significant