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【单选题】
在浓度相同的条件下，下列哪种石棉纤维的危害性最大A.
直径2.9μm，长度9μm
B.
直径3.9μm，长度12μm
C.
直径4.9μm，长度15μm
D.
直径5.9μm，长度18μm
E.
直径6.9μm，长度21μm
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反馈参考答案：
举一反三
【单选题】关于髓腔的描述下列哪项是错误的（）。
A.
青少年恒牙的髓腔比老年人大
B.
下颌第一二磨牙颊侧髓角较舌侧髓角高
C.
青少年恒牙的髓角高，制备洞型时容易穿髓
D.
老年人有时发生髓腔部分或全部钙化堵塞
E.
按牙体比例而言，乳牙髓腔较恒牙为大
【单选题】According to the passage, which of the following is true of the Rosetta stone?
A.
It was found by scholars trying to decode ancient languages.
B.
It contains two versions of hieroglyphic script.
C.
Several of its inscriptions were decoded within a few months of its discovery.
D.
Most of its inscriptions have still not been decoded.
【单选题】The plane will take off at 6:00 pm, so I have to be at the airport 4:00 pm at the latest.
A.
after
B.
until
C.
since
D.
by
【单选题】According to the paragraph 6, which of the following is true of carotene?
A.
They can be found in green vegetables.
B.
They are found in all animal livers and dairy products.
C.
They convert into vitamin A once consumed.
D.
They are chemical substances human body needs in order to survive.
【简答题】当他知道所发生的事情后,他坚决表示要严肃处理此事。
【单选题】Which of the following is NOT true according to the news?
A.
Born This Way Foundation is founded to create a kinder and braver world.
B.
People from Health and Human Services and Harvard will attend the launching.
C.
Whitney's The Bodyguard held the record with 21 weeks at Number One.
D.
The past week became the biggest sales week of Adele's 21 album.
【简答题】The plane will
in five minutes.
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