若集合M={-1，0，1}，N={0，1，2}，则M∩N等于[ ]
A．{0，1}
B．{-1，0，1}
C．{0，1，2}
D．{-1，0，1，2}
A
—Mr. Smith has got a very good job in the famous company.
—_____ he looks so happy.[ ]
A. It's certain
B. That's because
C. No doubt
D. No wonder
不易被碱催化水解的苷是
A．醇苷
B．酚苷
C．烯醇苷
D．酯苷
E．β-吸电子基取代的苷
