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__

A. Over B) Since C) Till D) Until

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Directions: In this part there are 30 incomplete sentences. For each sentence there are four choices marked A, B, C and D. Choose the ONE answer that best completes the sentence. Then blacken the corresponding letter on the Answer Sheet.
16. The driver was at loss when word came that he was forbidden to drive for speeding.
A a;/
B a;the
C the;the
D /;/

While remembered mainly for the invention of the telephone,
AB C
Alexander Graham Bell devoted his life to help the deaf.
D

77.A) typical B) true C) mere D) only

已知总体方差，显著性水平，检验的假设为：︰，︰，则检验的拒绝域应为（）。