i是虚数单位，若复数z＝(m2－1)＋(m－1)i为纯虚数，则实数m的值为________．
m＝－1
由题可得解得m＝－1.
There is ________ in his words. We should have a try. [ ]
A. something
B. anything
C. nothing
D. everything
生物休眠最主要的作用是______。
A．促进代谢 B．贮藏能量 C．抵御逆境 D．安全越冬
解得m＝－1.
解得m＝－1.