Lipinsky332 Lipinsky332

21-04-2015
English

Answered

The Salk vaccine has proved to be a(n) ___ protection against the crippling disease of polio. A. artless B. excrescence C. efficacious D. crescendo

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Chippey00 Chippey00

21-04-2015

i think the answer is C

Hope it helps

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