After the earthquake, the first thing the local government did was to provide ________ for the homeless families.

A．accommodation

B．occupation

C．equipment

D．Furniture

设A为实数，则下列算式一定正确的是（　　）

A．（cosA+isinA）²=cos2A+isin2A

B．（cosA+isinA）²=2cos2A+isin2A

C．（cosA+isinA）²=cos²A+isin²A

D．（cosA+isinA）²=cosA+isinA