必修第二册;01;在空白处填入1个适当的单词或括号内单词的正确形式。

1.Thefifthextinctionoccurredaround65millionyearsago,causingthe______（die）ofthedinosaurs.;4.BoththeWinterandtheSummerOlympicsareheldeveryfouryearsaregularbasis.;7.Sometimespeople’snon-verbalsignalscanbeinconflict_____wha