【题目】Researchers have been determined to ______ how bird flu spreads from human to human worldwide.
A. turn out B. figure out
C. pick out D. check out
在线课程【答案】B
【解析】考查词组辨析。句意：研究人员已经下定决心要弄清楚禽流感是怎样在世界范围内在人与人之 间传播的。A. turn out“证明是；结果是”；B. figure out“弄清楚”；C. pick out“挑选出”；D. check out“结 账离开”。故选B。