单项选择题

If a and b are the lengths of the legs of a right triangle whose hypotenuse is 10 and whose area is 20,what is the value of (a +b.2)（）

A.100
B.120
C.140
D.180
E.200

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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
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
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