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【单选题】
如果数据 的平均数为 ,方差为 ,则 的平均数和方差是( )A.
,
B.
2 +3,4
C.
2 +3,
D.
2 +3,4 +12s+9
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举一反三
【单选题】—Has your father got up? —Sorry, I’m not sure. He __________ got up. Please go and see for yourself.
A.
must have
B.
can’t have
C.
would have
D.
might have
【简答题】如图所示的手提包,用玉米皮为原料手工编结而成
【单选题】_______very late last night, my brother got up late and went to school without breakfast this morning. [ ]
A.
Working
B.
Having worked
C.
Worked
D.
To work
【单选题】Why does your brother want a new job ________ he's already got a very good one?
A.
where
B.
when
C.
which
D.
that
【单选题】We think _______ more vegetables _______ good for our health.
A.
eating, are
B.
eating, is
C.
eating, are
D.
eatting, is
【简答题】如果所示的手提包，用玉米皮为原材料手工编结而成。
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