出口食品生产企业“卫生注册证书”的有效期是（）年，“卫生登记证书”的有效期是（）年。
A.3；5
B.3；3
C.5；3
D.5；5
参考答案：B
Our teacher is kind _______ us. But sometimes she is kind _______ strict. [ ]
A. to; of
B. of; to
C. to; to
D. with; of
慰问信的写作要求有哪些
