—When _____ the Capital Museum _____?

—In 2005. It's been one of the symbols of Beijing from then on.[ ]

A. is; built

B. has; been built

C. will; be built

D. was; built

下列说法正确的是[ ]

A．青藏地区以种植业为主，西北地区以畜牧业为主

B．青藏地区比西北地区纬度低，所以夏季的气温比西北地区高

C．青藏地区多为外流河，西北地区多为内流河

D．青藏地区的人口密度比西北地区大