15．They in search of a cure for Ebola（埃博拉）now．

分析 他們現(xiàn)在在尋找治療埃博拉的方法．

解答 答案：They后面加are，考查謂語動(dòng)詞的用法，in search of"尋找"，介詞短語，不能直接充當(dāng)謂語動(dòng)詞，可以放在be動(dòng)詞后做表語，由now可知時(shí)態(tài)用一般現(xiàn)在時(shí)，主語是they，因此在其后面加are．

點(diǎn)評(píng) 考查謂語動(dòng)詞的用法，要注意區(qū)分句子成分．

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