1×2×3×4×5×6×7×8×9×0=______.
1×2×3×4×5×6×7×8×9×0=0.
故答案为:0.
A professor of biology gave a talk to more than 1000 students on elephants living conditions and the dangers _______ them.
A.face
B.facing
C.faced
D.are facing
为什么可以认为在减少污染中可交易的污染许可证优于庇古税?