单项选择题





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单项选择题
An operation, *, is defined as follows: for any positive numbers a and b. Which of the following is an integer
A．11*5
B．4*9
C．4*16
D．7*4
E． 9*9
单项选择题
Between which two consecutive two-year periods was there the greatest percent increase in the Democratic receipts
A．1981-82 to 1983-84
B．1985-86 to 1987-88
C．1989-90 to 1991-92
D．1991-92 to 1993-94
E． 1993-94 to 1995-96
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