本次考试初赛考察50道单选，练习题库提供300道练习题，初赛正式考试将直接从练习题库中随机抽取。
样题：
1.Advertising media like direct mail, radio, television, and newspapers ____ to increase the sales of industrial products.
You ____ business interfering with my affairs.
If you have never planted anything, you won’t be able to know the pleasure of watching the thing ____.