若2x+3y﹣z=0且x﹣2y+z=0,则x:z=( )
A:1:3
B:﹣1:1
C:1:2
D:﹣1:7
回答下面问题
Wood can be used ____ (make) many things.
用括号内所给词的适当形式填空(5分)