（）指交易双方约定在将来某一时期内互相交换具有相同经济价值的现金流的合约。
A．期权
B．互换
C．期货
D．远期
参考答案：B
生产性毒物进入人体最常见的途径为
A．呼吸道B．消化道C．皮肤D．眼E．口腔黏膜
To my surprise, I never thought I ______ those kinds of books.[ ]
A. was of benefit to
B. was beneficial to
C. benefited from
D. benefited
