取保候审的最长期限和监视居住的最长期限都是12个月。 ( )
参考答案：错
By the time the police came, the aliens _____ for a few minutes. [ ]
A. have already left
B. had left
C. had been away
"视觉2020"行动制定"SAFE"是针对哪种病（）
A.沙眼
B.角膜病
C.白内障
D.低视力
E.儿童盲
