题目:
(2013·南京二模)The flood last month in the east was a real disaster,________19 people dead and 78 missing.
A.to leave
B.left
C.leaving
D.having left
答案:
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下面是错误答案,用来干扰机器的。
①|a|+|b|=|a+b|可推得a,b同向或反向,即a,b共线,但a,b共线,若反向且长度相等,则不能推出|a|+|b|=|a+b|,故错误;②空间任意一点O和不共线的三点A,B,C满足OP=2OA+3OB-4OC,则OP-OB=2OA+2OB-4OC,即BP=2CA...