下面哪个不是上颌骨支柱
A．尖牙支柱B．颧突支柱C．翼突支柱D．上述三者都是E．腭突支柱
参考答案：E
－I've studied growing plants as one of my interests. Could I make some suggestions?
－ . [ ]
A. You will make it
B. Go right ahead
C. Don't mention it
D. Take it easy
计算：-3×2=（ ），5a-2a=（ ）
