单项选择题


Which of the following symbols should be substituted for □ to make both of the statements above true for all integers 77such that -2＜n≤3（）

A. ≤
B. ＜
C. =
D. ＞
E. ≥

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单项选择题
If y is the average(arithmetic mean)of n consecutive positive integers，n＞1，what is the sum of the greatest and least of the seintegers（）

A.A
B.B
C.C
D.D
E.E
单项选择题
If x，Y and z are consecutive integers and x＜y＜z，which of the following must be true（） Ⅰxyz is even． Ⅱx+y+z is even． Ⅲ (x+y)(y+z)is odd．

A. None
B. Ⅰonly
C. Ⅱ only
D. Ⅰ and Ⅲ only
E. Ⅰ，Ⅱ，and Ⅲ
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