问题
单项选择题
"Opt-out" mechanism is probably ______
A．a machine that can be attached to your computer
B．a button that you can make a choice to read or not to read
C．a software that you can play a computer game
D．an e-mail that says some good words to you
答案
参考答案：B
解析：[分析] 细节题型。 第四段第二句是个对比句：While some senders…provide simple and reliable ways for recipients to reject (or‘opt-out’of)receipt of…，other senders provide no such‘opt-out’mechanism…从中得知‘opt-out’应是reject的近义词；而‘opt-out’ mechanism应是前半句中提到的simple and reliable ways for recipients to reject receipt of……；因此选项B最符合题意。