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【单选题】
Nephrons are the most important working unit of the kidney becauseA.
they are exceptionally long and slender
B.
they are amzingly efficient in draining away water
C.
they are involved in all the three basic processes carried out by the kidney
D.
they have the characteristic shape of a punched basketball
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【单选题】听力原文：W：Why can't I make the international direct dial in my room, sir? M：Well, let me have a check. But have you paid the deposit for the telephone charge at the front desk? Q：What does the man sugges...
A.
To dial the right telephone numbers.
B.
To have the telephone repaired.
C.
To open the telephone service of the room.
D.
To remit the money to the bank.
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【简答题】Make sure ______________________ before you dial ;
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