Do you feel any discomfort after long time of sedentary work？ {A; B; C}A. 你长时间坐着工

Do you have any experience on Linux？

Do you have any experience on Linux？

Do you have any experience on Linux？

If you have made any mistake in the class, dont feel ashamed for it. Its common for studen

－ Do you have any suggestions about it －（)

I hope you like my book and please feel free to make any comments and suggestions（