单项选择题
A. 1 B. 10 C. 70 D. 100 E. 700
If a and b are integers and a-b=6，then a+b CANNOT be（） ...
单项选择题If a and b are integers and a-b=6，then a+b CANNOT be（）
A. 0 B. less than 6 C. greater than 6 D. an even integer E. an odd integer
If the sum of five consecutive even integers is 70，what...
单项选择题If the sum of five consecutive even integers is 70，what is the value of the greatest of the five integers．（）
A. 12 B. 14 C. 18 D. 20 E. 22
If r and 8 are positive integers，each greater than 1，an...
单项选择题If r and 8 are positive integers，each greater than 1，and if 11(s-1)=13(r-1)，what is the least possible value of r+s（）
A. 2 B. 11 C. 2 D. 24 E. 26
