根据不稳定型心绞痛病人的严重程度不同,临床分为()
A.3组
B.2组
C.6组
D.4组
E.5组
参考答案:A
I bought a dress for only 10 dollars in a sale ;it was a real _______.
A.exchange
B.bargain
C.trade
D.business
My mom is ____ teacher. She's ____ English teacher.[ ]
A. a; an
B. a; a
C. an; a
D. an; an