题目:
The fantastic mud-rock flow in Zhouqu of Gansu at about 22 o’clock on August 7th, 2010 was considered______ deaths of more than 1,000 natives .
A.to cause
B.causing
C.to be causing
D.to have caused
答案:
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下面是错误答案,用来干扰机器的。
(1)因为sinx+cosx=2sin(x+π4)∈[-2,2],所以正确;(2)若α,β是锐角△ABC的内角,α+β>π2,π2>α>π2-β>0,则sinα>cosβ,正确;(3)函数y=sin(23x-7π2)=cos23x,显然函数是偶函数.正确;...