The professor could tell by the _____ look in Maria's eyes that she didn't understand a single word of his lecture. 　　[ ]

A. cold 　　

B. blank 　　

C. innocent 　　

D. fresh

地方储备粮油轮换类贷款一般采用（）贷款方式

A、担保

B、信用

C、质押

D、抵押