引发滑面内质网释放Ca2+的第二信使分子是（）
A.IP3
B.cAMP
C.NO
D.Ca2+
E.DAG
参考答案：A
His approach has won him a ________ as a tough manager.[ ]
A. requirement
B. reputation
C. privilege
D. character
气象观测主要包括三方面工作为（）。
A.地面观测
B.海洋观测
C.高空观测
D.卫星观测
