The ultimate purpose of Dr. Parrack's study is to

The ultimate purpose of Dr. Parrack's study

Multiple choice — select the best answer

Astudy causes of deafness.
Bincrease speeds of planes.
Creduce loss of life in animals.
Dsuggest safer flying methods.
Edecrease danger to aviators who fly jet-propelled planes.

✓ Correct answer: E. decrease danger to aviators who fly jet-propelled planes. This is a good summary of the first two sentences.

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