After the trainer was sure that the whale could look after itself, he __________it into the sea.

A．transported

B．unloaded

C．released

D．handled

发酵品的质量要求主要包括：（）

A.气味芳香，无酸败味

B.有霉味

C.曲块坚实

D.曲块表面布满黄白色霉衣

E.曲块内部有斑点