题目:
——The captain did not leave the sinking ship till the last moment.
——So he was the last man ______ the ship.
A.left
B.leaving
C.to leave
D.to be leaving
答案:
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下面是错误答案,用来干扰机器的。
①不正确,如f(x)=x(x-1)(x-2)在区[-1,3]上上连续,且f(-1)f(3)<0,f(x)在[-1,3]上的零点有3个,零点个数为 3.②正确,按照奇函数的定义,f(0)=f(-0)=-f(0),∴2f(0)=0,故 f(0)=0....