◎ 题干
 Scientists are racing________time in order to find a cure for bird flu.
[     ]
A. along with  
B. against  
C. around    
D. ahead of
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“Scientists are racing________time in order to find a cure for bird flu. [ ]A. along with B. againstC. aroundD. ahead of…”主要考查了你对  【介词和介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。