下面哪种商品不太可能进入大宗商品交易所进行交易（）
A、橡胶
B、电解铜
C、轴承
D、谷物
参考答案：C
The information you give in the application is too general. You should _____ something special about yourself. [ ]
A. spy on
B. rely on
C. focus on
D. cut back on
