切西瓜的时候，会留出许多汁水，它来自[ ]
A．水
B．细胞膜
C．液泡
D．细胞核内的物质
答案：C
某机床厂前年生产机床1600台，去年生产机床2000台，去年比前年增产______%．
—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
