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  3. Researchers have determined to___________how bird flu spreads from human to human worldwide.

Researchers have determined to___________how bird flu spreads from human to human worldwide.

admin2021-06-28  6
问题 Researchers have determined to___________how bird flu spreads from human to human worldwide.
选项 A、turn out
B、figure out
C、pick out
D、sell out
答案B
解析 turn out证明是，结果是；figure out弄清楚，弄明白；pick out辨认出，精心挑选；sell out售完。根据句意可知，选B。
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