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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