呼吸系统疾病的主要症状包括（）。
A.咳嗽
B.咳痰
C.咯血
D.呼吸困难
E.胸痛
参考答案：A, B, C, D, E
—I’ll tell Mary about her new job tomorrow.
—You ________ her last week.
A．ought to tell
B．would have told
C．must tell
D．should have told
注水强度
