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4 The green tree is higher than the yellow tree. 5 In winter it is colder than in summer. 6 My grandparents are older than my grandparents. 7 Rick is taller than Bob. 8 February is shorter than March. B 1/ Alice is the youngest of the children. 2 Winter is the coldest season in a year. 3 Snail is the slowest animal. 4 Summer is the hottest season. 5 February is the shortest month in the year. 6 Giraffe is the tallest animal in the picture.