He was away for a week. What happened _______ him?[ ]
A. about
B. with
C. for
D. to
答案:D
His girlfriend wore a______ smile when seeing the nice dress she wanted.[ ]
A. satisfied
B. satisfying
C. being satisfied
D. satisfy
属于微囊的制备方法的是()
A.乙醚注入法
B.逆相蒸发法
C.超声波分散法
D.溶剂一非溶剂法
E.薄膜分散法