The term "castle-in-the-air" is actually a term that means something that is imaginary and extravagant and most likely are not realized or carried out. In other words, this is similar to the term "daydream". When we use TV as <span>"castle-in-the-air", the danger for this is that people tend to view something as a reality instead of just accepting it as fantasy. Hope this helps.</span>
The passive voice formed by Subject + verb to be+Past Participle. The object in the active voice becomes the subject of the passive voice and the subject of the active voice is either the object in the passive voice or is not mentioned.
The passive voice is used when we don't know the performer of the action. Example: “The house was built in 1884” in this case we don't know who built the house.
The passive voice is used when the focus is on the receiver of the action. Example: “Five people were killed in a car accident”, in this case the focus is on “five people”
The passive voice is used when the focus is on the action. Example: “The car was stolen”, in this case the emphasis is on the fact that the car was stolen and not on who stole it.
So the three options that apply to the uses of the passive voice are:
when the performer of the action is unknown
when you want to emphasize the action directly
when you want to emphasize the receiver of the action
Answer:
B. citing scientific evidence
Explanation:
In the essay "On the Mode of Communication of Cholera," the primary technique that author John Snow uses to support his claim that cholera spreads from person to person is "citing scientific evidence".
Snow scientifically revealed how cholera is transmitted through the medium of polluted water, its propagation by morbid poison that enters the alimentary canal and its communication in crowded areas were poor people reside.
Snow showed that cholera specifically showed how the disease spread by water contaminated by faeces.
John Snow was an English Physician and also led in the development of medical hygiene.
