The text boxes in the left panel have been placed in a random order. Restore the original order by dragging the text boxes from the left panel to the right panel.
左栏的文本框排列顺序是乱的。请把它们拖到右栏，恢复成原文的正确顺序。
Source
1To gauge optimism and pessimism, the researchers set up an experiment involving 22 calves.
2In the training, each calf entered a small pen and found a wall with five holes arranged in a horizontal line, two-and-a-half feet apart.
3Before they started the experiment, they trained the calves to understand which of their choices would lead to a reward.
4The calves learned quickly which side of the pen held the milk reward.
5The hole at one end contained milk from a bottle, while the hole at the opposite end contained only an empty bottle and delivered a puff of air in calves'faces.
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