Choose the appropriate prepositions for the given sentence: Polio is a disease caused ________ a virus that invades the nervous system ________ droplet infection and can cause paralysis ________ two hours.
by, through, in
Understanding Prepositions in the Polio Sentence
The question asks us to choose the appropriate prepositions to complete the given sentence about Polio. Let's look at the sentence:
"Polio is a disease caused ________ a virus that invades the nervous system ________ droplet infection and can cause paralysis ________ two hours."
We need to fill the three blanks with the correct prepositions that fit the context of cause, method of transmission, and time frame.
Analyzing Each Blank for the Correct Preposition
Let's break down the sentence and consider the best preposition for each gap:
- First Blank: "caused ________ a virus"
- When we talk about the agent or source that causes something, we typically use the preposition "by". For example, "The fire was caused by lightning."
- Therefore, the first blank should be filled with "by".
- Second Blank: "nervous system ________ droplet infection"
- This part describes how the virus is transmitted or how it affects the system. "Droplet infection" is a method or means of transmission.
- To describe the means or method through which something happens, we often use the preposition "through". For example, "Information spreads through social media."
- Therefore, the second blank should be filled with "through".
- Third Blank: "paralysis ________ two hours"
- This phrase indicates a time frame within which the paralysis can occur after the infection.
- When specifying that something can happen within a certain period, the preposition "in" is commonly used to mean 'within the space of'. For example, "He finished the test in thirty minutes."
- Therefore, the third blank should be filled with "in".
Completing the Sentence
Putting the prepositions together, the completed sentence reads:
"Polio is a disease caused by a virus that invades the nervous system through droplet infection and can cause paralysis in two hours."
The sequence of prepositions that correctly fills the blanks is "by, through, in".
Checking the Options
Now, let's look at the provided options and find the one that matches our sequence "by, through, in":
- Option 1: on, about, from (Incorrect)
- Option 2: on, with, near (Incorrect)
- Option 3: at, near, about (Incorrect)
- Option 4: by, through, in (Correct)
Option 4 provides the correct sequence of prepositions.
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