I was given three books on cooking, the first __________ I really enjoyed.

A．of that

B．of which

C．that

D．which

我国第一个流行色组织是“中国丝绸流行色协会”，总部设在上海，它每年召开2次年会，（）流行色。

A.研究

B.预测

C.发布

D.制定

E.规定