维生素B1的理化性质是
A．具碱性、水溶性B．具酸性、水溶性、旋光性C．具酸性、水溶性D．具酸性、脂溶性E．具碱性、脂溶性、旋光性
参考答案：A
计算的值是().
A.A
B.B
C.C
D.D
If he did not know them，he would greet them with a few words about weather，but if he did，he would ask about their families or make jokes，always cutting his cloth ______his customers.
A．according to
B．due to
C．instead of
D．up to
的值是().