Question

select the correct answer.

read the following sentence from paragraph 9.

9 a material invented by argonide corporation, however, made up of positively charged microscopic alumina fibers, can remove virtually all contaminants, including bacteria and viruses, despite having significantly larger pores — allowing a much higher flow rate.

what is the meaning of contaminants as it is used in the sentence?

large alumina fibers
negative charges
activated carbons
polluting substances

Explanation:

Analyze the context clues

The sentence states that the material "can remove virtually all contaminants, including bacteria and viruses." The phrase "including bacteria and viruses" serves as an direct example of what the "contaminants" are. Since bacteria and viruses are harmful, polluting, or unwanted substances in water, "contaminants" refers to polluting substances.

Evaluate the given options

• "large alumina fibers" refers to the material's composition, not what it removes.
• "negative charges" refers to physical properties, not the impurities being filtered.
• "activated carbons" is another filtration medium, not the impurities.
• "polluting substances" directly matches the definition of impurities like bacteria and viruses that need to be removed.

Answer:

• large alumina fibers
• negative charges
• activated carbons
• polluting substances (Correct answer)