A mysterious illness, referred to as “ a typical phenomena”, has been brought under control, the government said on Wednesday, ______ no cause of it has been made public.

A．though

B．when

C．that

D．because

下列各项中，( )也称扩大结构定额，它规定了完成一定计量单位的扩大结构或扩大分项工程的人工、材料、机械台班消耗量的数量标准。

A．人工定额

B．概算定额

C．概算指标

D．施工定额