单项选择题

The water level in a tank is lowered by 6 inches, then raised by inches, and then lowered by 4 inches. If the water level was x inches before the changes in level, which of the following represents the water level, in inches, after the changes （）

A.A
B.B
C.C
D.D

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单项选择题
For which country was the ratio of its savings rate to its real GNP growth rate greatest （）

A.Japan
B.Canada
C.Australia
D.Italy
E.Switzerland
单项选择题
Josh works on the second floor of a building. There are 10 doors to the building and 8 staircases from the first to the second floor. Josh decided that each day he would enter by one door and leave by a different one, and go up one staircase and down another. How many days could Josh do this before he had to repeat a path he had previously taken（）

A.80
B.640
C.800
D.5040
E.6400
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