依次填入下列横线处的词语，最恰当的一组是( )研究伊始，该团队选取了华北、西北地区生产的几十种马铃薯进行分析________，从营养成分、________、硬度等方面多次试验，________确定了适合加工马铃薯面条的两个品种。随后，又从诸多面粉种类中试验选取了______的小麦粉加以调试。

Jess was sad and her friend helped her ________thefirst awful weeks after her husband Bill died

lay an important role inmodern life, but they ______ also cause many problems like air pollution

How did he break his head while swimming?— ______ my warnings, he dived straight into the shallow water. [ ]

下列词语中没有错别字的一组是(　　)