计算：[（-x2y）3]2·（-xy2）。
解：原式=。
The world thinks highly of _____ China and its people have achieved in the last year. [ ]
A. that
B. what
C. which
D. how
表明机舱失火的警报信号是（）
A.一阵乱钟（1min）
B.一阵乱钟后，击四响
C.一阵乱钟后，击三响
。
。