单项选择题

If you can''t dig into the field you have chosen for your pursuit, it is hardly possible for you to achieve anything significant in the field.（）

A．acquire
B．require
C．accompany
D．accomplish

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单项选择题

This reflects the priority being attached to economic over political activity, partly caused by a growing reluctance to enter a calling blighted by relentless publicity that all too often ends in destroying careers and reputations.（）

A．divine summons
B．political career
C．profession
D．business transaction

单项选择题

Since Jonas Salk came up with his polio vaccine, infantile paralysis has virtually disappeared from the United States.（）

A．surfaced with
B．raised the price of
C．discovered
D．elevated

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