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【单选题】
咖啡样品测定总酸度前,取一定样品进行预处理其方法为()A.
加热溶解，，干过滤
B.
加热，除二氧化碳
C.
加乙 醇沉淀， 过滤
D.
，过滤
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举一反三
【单选题】I wonder _______ there are so many natural disasters across the world in 2010.
A.
why is it
B.
it is why that
C.
why is it that
D.
why it is that
【单选题】I wonder why he ______ to discuss the problem at the meeting.
A.
declined
B.
rejected
C.
refused
D.
delayed
【单选题】I wonder why he______to discuss the problem at the meeting.
A.
declined
B.
rejected
C.
refused
D.
A／C
【单选题】I wonder _____ there are so many natural disasters across the world. [ ]
A.
why is it that
B.
what is it that
C.
what it is that
D.
why it is that
【单选题】－I wonder ____________. －Zebras.
A.
what do they call these animals
B.
why they call these animals
C.
What they call these animals
D.
why do they call these animals
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