Multiple choice

Directions: In the following passage, the opening statement has been deleted. Which of the statements given below the passage, should precede the passage?

Yet its safety has never been proven scientifically and it continues to be used routinely by many dentists to fill tooth cavities. As the second most toxic substance on this planet (second only to plutonium), mercury leaks out of dental fillings to enter the body. Mercury can interfere with virtually any process or organ in the body. Of considerable importance is the documented fact that mercury has an affinity for nerve tissue and the amount of mercury that concentrates in the brain is proportional to the number of mercury fillings one has in their mouth.

  1. Another major triggering factor that has come to light is the poisonous effects of mercury that leaks out of conventional dental filling.

  2. As an enzyme poison, mercury disrupts many bodily processes with the end result that its victims can suffer from a multitude of symptoms.

  3. It has been documented that as mercury travels along the nerve fiber it destroys the tubulin tracts within the nerve.

  4. Mercury has been traditionally used for dental fillings.

  5. Dental filling using mercury causes several health hazards.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The passage begins with the pronoun 'its' and a negation 'yet'. So the preceding sentence ought to have a noun as subject and something that is negated by 'Yet its safety has never been proven scientifically'. (4) is the best fit.

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