单项选择题

When asked what a manager’s role is, Mr. Pitt sounds______.

A．confident
B．hesitant
C．resolute
D．doubtful
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单项选择题
Dale Jorgenson points out that the 2.78 grow rate will be continued in the next______.
A．2 years
B．10 years
C．20 years
D．5 years
单项选择题
The writer suggests that there is no sense in buying the latest volume ______.
A．because it is not worth the price
B．because it has fewer entries than before
C．unless one has all the volumes in his collection
D．unless an expanded DNB will come out shortly
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