治疗肺炎链球菌肺炎，首选的抗生素是（）
A.青霉素
B.红霉素
C.链霉素
D.磺胺药
E.氯霉素
参考答案：A
早稻和晚稻的根本区别在于它们对温度的反应的不同。
---If I had time, I would go shopping with you.
---But you___ too busy.
A．were
B．had been
C．are
D．have been
