以下哪项是药物对胎儿致畸影响的高危期()
A.受精开始到受精后21天
B.受精后第21--56天
C.受精开始到受精后56天
D.受精后56天以后
参考答案:B
I feel sure that ________ qualification,ability and experience,you are abundantly suited to the position we have in mind.
A.in need of
B.in terms of
C.in favor of
D.in face of
The computers are _____ sale _____ $500! [ ]
A. on; for
B. in; at
C. of; to
D. at; on