premise: But since the sun was shining and it was so warm , we decided to take a tourist boat ride along the Seine . We saw a whole bunch of stuff and relaxed in the sun . Linnea and Tina , coming from Scandinavia and thus not used to sunniness at this time of year , always roll up their sleeves and refuse to sit in the shade . Why did Linnea and Tina refuse to sit in the shade ?
hypothesis: Because it was so warm .