The Salk vaccine is a major factor in the fight to eradicate polio.
A.completely destroy
B. carefully disguise
C. sustain
D. contain
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正确答案: A 答案分析:无
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A.completely destroy
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A.completely destroy
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B. carefully disguise
C. sustain
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C. sustain
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B. carefully disguise
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B. carefully disguise
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A.completely destroy
B. carefully disguise
C. sustain
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A.completely destroy
B. carefully disguise
C. sustain
D. contain
A.completely destroy
B. carefully disguise
C. sustain
D. contain