[解析]
66.they outside home in a ,by a ,or sitting a car the is and .细节理解题 most a picnic a meal eat the ,usually a park a river even in a if weather cold wet,通常在公园,如果天冷或下雨.故答案为:they outside home in a ,by a ,or sitting a car the is and .
67.the words .细节理解题 word comes the words 可知picnic这个单词来自于法语单词piquer French piquer.
68.The .细节理解题 British the words it changed letters make .英国人使用这个法语单词但是把它变成picnic British.
69.go parks these .细节理解题 some there big on days of go parks these .在一些国家在特别的日子举行野炊.故答案为:go parks these .
70.the picnic.本文主要讲述了许多人喜欢的野炊活动.