（）是社会上众人以言论形式表现的对于某一事件或现象的大致相同的看法，是公众对于此一事件或现象的是或非的评价。
参考答案：社会舆论
It was along the Mississippi River ______ Mark Twain spent much of his childhood _____ the story happened.
A. which; that B. that; which C where; that D. that ;that
脉冲序列不包括（）
A.射频脉冲
B.层面选择梯度场
C.相位编码梯度场
D.频率编码梯度场
E.主磁场
