下列各项中不是动物在自然界中所起作用的是[ ]
A．帮助植物传播种子
B．促进生态系统的物质循环
C．帮助植物传粉
D．是生物圈中有机物的制造者
答案：D
若（x-1）0=1，则x应满足的条件是（ ）
Soccer is the most truly international team sport, but there’s still some question _____ whether it should be called a game or open warfare.[ ]
A. due to
B. in addition to
C. as to
D. owing to
