读下面两封信判断正误。

1．Jenny doesn't want to look unfriendly．

2．Waldo agrees with his parents．

3．Jenny feels happy all the time．

4．Jenny used to be heavy．

5．Waldo likes his little brother．   

土基的压实是路基施工及其重要的环节，是保证路基质量的关键。在实际操作中，压实度表示某一有限厚度的路面结构经碾压后的（）。