Relier Pairs DO YOU KNOW? cz.5Version en ligne Find answers to the questions by clicking the right boxes. par Monika Wójcik 1 Do horses and giraffes sleep standing up? 2 When was the $ sign introduced? 3 Are camels born with humps? 4 When were plastic bottles first used for soft drinks? 5 When was the tea bag invented? 6 How many colours can crocodiles distinct? 7 When was the first English dictionary written? 8 Which animals are the only mammals that can fly? 9 Can whales swim backwards? 10 How much water can an elephant's trunk hold? in 1788 in 1970 in 1908 No None. They are colour blind. bats No over 5 litres Yes in 1755