与青春期第二性征发育有直接关系的物质是 [ ]
A．雄性激素和雌性激素
B．睾丸和雌性激素
C．雄性激素和卵子
D．雌性激素和精子
A
为气血生化之源的五脏是()
A．心
B．脾
C．肾
D．肝
E．肺
_____ the bad weather, the swimming match had been put off. [ ]
A. Because
B. Thanks to
C. With the help of
D. For
