Skip to main content
. 2015 Mar 27;6:311. doi: 10.3389/fpsyg.2015.00311
Definitely choose A2' Definitely choose B2'
1 2 3 4 5 6 1

A2': at the expense of 1 day of training time, participate in a tour for 1 day tomorrow.

B2': at the expense of 2 days of training time, participate in a tour for 2 days in a week.