We have to give the users something new ________ what we’ve already offered, which is the only way to broaden the appeal of the website.

A．regardless of

B．in addition to

C．in exchange for

D．according to

合作性专业发展教育视导模式是由（）提出的。

A.戈德哈默

B.科根

C.格拉特霍恩

D.瑟吉万尼