稳定型心绞痛的常见诱发因素有（）
A.饱食
B.大便用力
C.劳累
D.受寒
E.情绪激动
参考答案：A, C, D, E
In such dry weather, the flowers will have to be watered if they _____. [ ]
A. have survived
B. are to survive
C. would survive
D. will survive
The teacher asked the two students to discuss the question in a low voice ________ they should bother the others.
A．so that
B．in case
C．in order that
D．now that
