—Where ________ you born?
—In a small town.
A:was
B: were
C:be
D: are
设a,b,c都是正实数,求证:aabbcc≥abca+b+c3
顺口溜
平舌声母zcs不会坐椅子,屁股落到椅背,变成翘舌____,____ ,____。