一元质量一般是顾客( )需求。
A．明示的
B．隐含的
C．必须履行的
D．无关紧要的
参考答案：A
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
人体生殖系统的发育和功能维持受________的控制。
