莲子的功效是
A．化瘀止血B．涩肠止带C．敛肺涩肠D．补脾止泻E．补肾助阳
参考答案：D
There are five chairs ___ ,but I am at a loss which to buy .
A．to be chosen
B．to choose from
C．to choose
D．to be chosen from
4，5，8，10，( )，20
A．15
B．16
C．17
D．18
