题干
Many experts agree that there is a possibility___ in this area in the following days.
A：when some more earthquakes may happe
B：that some more earthquakes may happe
C：where may some more earthquakes happe
D：what may some more earthquakes happe
答案(点此获取答案解析）
B
,样本标准差分别为
和
,则（ ）