奇数加奇数的和一定是[ ]
A.偶数
B.奇数
C.质数
D.无法确定
答案:A
I feel sorry for myself .If I more efforts to my studies , I wouldn’t be doing a job with such low wages.
A devoted B had devoted C should devote D were to devote
腮腺导管口的正确位置位子
A.在平对上颌第一磨牙牙冠的颊黏膜上B.以上都不对C.在平对下颌第二磨牙牙冠的颊黏膜上D.在乎对上颌第二双尖牙牙冠的颊黏膜上E.在乎对上颌第二磨牙牙冠的颊黏膜上