血小板诱导剂有( )
A．ADP
B．肾上腺素
C．凝血酶
D．胶原
E．以上都是
参考答案：E
（）是实现C++语言运行时多态性的机制。
______ they grow they make sure that what is left in the ground after harvesting______ a natural fertilizer for the next year’s crop.
A．Whatever; become
B．Whichever; become
C．Whatever; becomes
D．Whichever; becomes
