The biggest whale is ________ blue whale, which grows to be about 29 meters long-the height

of ________ 9story building. [ ]

A. the; the

B. a; a

C.a;the

D.the;a

期货交易所的职能包括（）

A.提供交易的场所、设施和服务

B.设计合约、安排合约上市

C.制定并实施期货市场制度与交易规则

D.组织并监督期货交易，监控市场风险，发布市场信息