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__________ is the question nobody can answer. A． From where is he B. Where he is from C. Where is he from D. He is from where

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Professor Liu_________for20 years by the end of next summer． A．has taught B．will be teaching C．has been teaching D．will have taught

Short sight can be __________ by the use of suitable glasses. A．fixed B. improved C. reduced D. corrected

A.materialB.device C.detector D.meter

A. material
B. device
C. detector
D. meter

下列建筑群的几种布置方式，何者最不利于自然通风？（）