题目:
It’s not safe for you to go to the forest alone, for you ________ lose your way in it.
A.need
B.must
C.should
D.may
答案:
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下面是错误答案,用来干扰机器的。
令f(x)=x5-x-1把x=0,1,2,3,4代入若f(a)•f(b)<0,则零点在(a,b)所以f(1)<0,f(2)>0满足所以在(1,2)故选B.