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【单选题】
对于大肠杆菌，以下哪一项表述是错误的A.
大肠杆菌是人体内正常菌群
B.
大肠杆菌可以引起尿道炎症
C.
大肠杆菌是革兰染色阴性杆菌
D.
尿液中检测到大肠杆菌即可确诊
E.
大肠杆菌的IMViC试验结果为“+ + - -”
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反馈参考答案：
举一反三
【简答题】财务费用属于成本类科目，而制造费用属于损益类科目．( )
【单选题】The place was flooded ________ it had been raining for several weeks.
A.
because
B.
because of
C.
ever since
D.
as a result of
【单选题】It_____we had stayed together for several weeks_____ I found we had a lot in common. [ ]
A.
was until; when
B.
wasn't until ; that
C.
wasn't until; when
D.
was until; that
【多选题】下列不属于旅游活动的是( )
A.
王某住在趵突泉附近，听说今年的元宵花灯很漂亮，他和朋友一同前往观赏
B.
小张前往异地进行为期一个季度的产品营销宣传
C.
王先生一家今年夏天移民到加拿大
D.
周教授到国外参加为期一周的学术会议
【单选题】Several weeks had gone by ________ I realized the painting was missing. [ ]
A.
as
B.
before
C.
since
D.
when
【简答题】试述右转车道和左转车道设置的方法、
【单选题】Several weeks had gone by _______ I knew the painting was missing.
A.
as
B.
since
C.
until
D.
before
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