题目

 The researchers found clear and convincing evidence _________ happiness is the key when it comes to better health and longer lives.   A. where                B. whether              C. how             D. that 答案：D根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 A： How are you getting to London, Jim? B： 　1　 A： By bicycle? From Beijing? That's a long trip. B： 　2　 A： 　3　 B： Perhaps about a year and a half. A： 　4　 B： There are four of us. A： It's a great idea. Good luck with your trip! B： 　5　 A． How many of you are making the trip? B． Good-bye! C． Thanks a lot. D． By bicycle E． It's about 20,000 kilometres. F． How long will it take you to complete the trip? G． Why are you making this journey?