单项选择题

The primary objective of Basic Econometrics is to provide an elementary but an comprehensive introduction to the art and science of econometrics.

A．brief
B．precise
C．simplified
D．extensive
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单项选择题
A．forB．toC．according toD．with
A．for
B．to
C．according to
D．with
单项选择题
We, Our, and Us in the first paragraph refer to ______.
A．Pius XII himself.
B．Pius XII and the College of Cardinals.
C．an unknown group.
D．something that cannot be determined by the text.
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