【解答】
Ⅰ [出典:'The Remarkable Power of the Pricky Pear', by Miguel Trancozo Trevino, BBC Future Planet, May 26, 2020.]
1.
(1) ① abundantly
(2) ④ emigration
(3) ② be reused as a source of fuel
2.
(1) ② By recycling waste from a different industry
(2) ③ Replacing fossil fuels
3. ③ [ウ]
4. [出典:'These Cute Fuzzy Moss 'Mice' Are Herding Their Way Across The Arctic', by David Nield, ScienceAlert, May 25, 2020."]
(1) ③ the movement of clumps on glaciers
(2) ① ponder
(3) ① some unknown force
(4) ④ a mixture of moss and dirt
(5) ② synchronized for some mysterious reason
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