单项选择题

(Let’’s not) waste time on (matters of no important). We have other (vital) problems to (deal with).

A．A
B．B
C．C
D．D
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The agriculture revolution in the nineteenth century involved two things; the invention of labor-saving machinery and the development of scientific agriculture.
单项选择题
The (director) and (manager) of the department (are) very strict (with) the employees.
A．A
B．B
C．C
D．D
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