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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The figure above consists of 2 5 squares．If the figure were folded along the dotted diagonal to form a flat triangle，then 26minus the number in the square that would coincide with the square containing 26 would be（）

A. 13
B. 14
C. 15
D. 16
E. 17

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Saplings are to be planted 30 feet apart along one side of a straight lane 455 feet long．If the first sapling is to be planted atone end of the lane，how many saplings are needed（）

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

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