题目：
Do you know what the White House is? Perhaps some of you do，while others don't.
The White House is a house in Washington. The president of the U.S.A. lives in it. It's really white. But do you know why the White House is white? The story happened in 1812. That year England was at war with America. The British army got to Washington and set the president's house on fire. In 1814，in order to hide the marks of the fire，the stone walls of the president's house were painted white and it has been the "White House” ever since.
小题1:White House is a house for ___________.
A. the American people.
B. the soldiers of U.S.A.
C. the presidents of U.S.A.
D. the patients of U.S.A.
小题2:England fought with America in ____________.
A．1810
B．1812
C．1814
D．1916小题3:The house is called "White House" because ____________.
A．it's covered with snow
B．the house is very clean
C．the stone walls of the house were painted white
D．they like white colour小题4:The White House was painted white because ____________.
A．the house is old
B．the house is new
C．it was once on fire and was with marks
D．they have enough paint小题5:"ever since" means ___________.
A．never
B．once
C．from then on
D．Before
答案：
小题1:C
小题2:B
小题3:C
小题4:C
小题5:C
文章讲的是白宫的作用和白宫这个名字的由来。
小题1:事实细节题。 根据第二段地一行可知
小题2:事实细节题。根据第二段“The story happened in 1812. That year England was at war with America. ”可知
小题3:事实细节题。根据第二段“the stone walls of the president's house were painted white”可知。
小题4:事实细节题。根据第二段第四行可知
小题5:词义判断题。意为自从那时。
，若小球质量为m，则此时
