I've found there would be the option 'two-sided' in page setup. But there is only one option: 'one-sided' for me. The printer's setting is correct, and I can print 'pdf' files in 2-sided. I don't know how to set. How can I recall the '2-sided' right when I printed?

Now, the alternative solution is that I print the web article into pdf file. Consequently, I can use the adobe to print on the paper in 2-sided format.