Choose the word or set of words that, wheninserted in the sentence, best fits the meaningof the sentence as a whole.
Bromelain, an enzyme found in pineapples, is not ------- in preventing bone and joint diseases, whichcan make bones susceptible to injury, but it can help injured bones -------.
(A) corrective . . heal
(B) effective . . recover
(C) detrimental . . multiply
(D) supportive . . degenerate
(E) vital . . persist
答案:B
解析:
It makes sense to say that although bromelain is not"effective" against, or cannot prevent, bone injury,it is effective in helping injured bones "recover."
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