Which method is more and more people comfortable with to know the products or services?
A. Using the Internet.
B. Using traditional advertising or shopping ways.
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What makes customers buy things online anytime and anywhere?
A. Portable devices.
B. 24-hour, 365-day access.
How did one of my friends solve the problem of luggage lost?
A. Bought her new dresses on the Internet.
B. Took a taxi to a shop to buy new dresses.
图像分割方法主要分以下几类（）。
A. 基于阈值的分割方法
B. 基于区域的分割方法
C. 基于边缘的分割方法
D. 基于特定理论的分割方法
边缘检测的算子有：
A. Sobel算子
B. Laplacian算子
C. Scharr算子
D. Roberts交叉梯度算子
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