Aborigines most common tool in Australia is boomerang which is used to kill animals.A.

问题补充：

Aborigines most common tool in Australia is boomerang, which is used to kill animals.

A. the;/

B. /;/

C. the; the

D. /;the

答案：

(答案→)A. the;/

B. /;/

C. the; the

D. /;the

解析：考查冠词的用语。boomerang是可数名词,在前面加the表类指,animals已经用了复数表类指,所以不加冠词。