设集合M={m∈Z|-3<m<2},N={x|x2-x=0},则M∩N=[ ]
A.{-1,0,1}
B.{0,1}
C.{-2,-1,0,1}
D.{1}
答案:B
Mrs. Weng came back from France in 2010. She _______ there for four years. [ ]
A. works
B. worked
C. has worked
哪些因素影响微生物发酵产酶?如何提高微生物产酶量?