解方程或比例
0.15：18%=（7+0.5）：x． |
（1）
÷5 w
=2 3
，3 4
÷5 w
×2 3
=2 3
×3 4
，2 3
=5 w
，1， 2
w=10；
（2）0.15：18%=（7+0.5）：x．
0.15x=0.18×7.5，
0.15x=1.35，
0.15x÷0.15=1.35÷0.15，
x=9．
| 完形填空。 | ||||
| Do you know what the White House is? Perhaps some of you 1____________, while (而) some don't. The White House is the 2__________ where the President (总统) of the U. S. A. lives. It is 3__________ Washington D. C. It is really 4____________. But do you know 5____________ the White House is white? The story 6____________ back to 1812. That year Britain was at war with 7____________. The British soldiers (士兵) captured (占领) Washington, 8____________ some buildings including the President's house were set on 9____________. In 1814, 10____________ hide the marks (痕迹) of the fire, the brown stone walls of the President's house were painted white and it has been called the " White House " since then (从那时起).
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