设集合M={-1，0，1}，N={x|x2≤x}，则M∩N=[ ]
A.{0}
B.{0，1}
C.{-1，1}
D.{-1，0，0}
答案：B
If nature does not provide man with the necessary material, it is the laboratory _____ he will turn to for it.[ ]
A. where
B. that
C. which
D. what
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