【单选题】The same gestures, signs and so on, in other words, body language, may express different ideas or meanings in different cultures, so don't use them _______ you are definitely sure of what they mean so...
【简答题】阅读理解。 Many children first learn the value of money by receiving an allowance (pocket money). The purpose is to let children learn from experiences at an age when financial mistakes are not very costly...