1-1同步检测 ⅰ.根据句意及首字母提示补全单词 1．who invented the first steam e________？ 2．who used peas to show how physical c________ are passed from parents to their children? 3．who discovered r________？ 4．a________the result，and you can get a conclusion. 5．do you know how to prove a new idea in s________ research? 答案：1.engine 2.characteristics 3.radium 4.analyse 5．scientific
