单项选择题

The word" they" in "... together they threaten to confuse." (Line 3, Para 5) refers to ______.

A．engineering and the liberal arts
B．reality and noble ideals
C．flexibility and a value system
D．practicality and rationality
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单项选择题
In the eyes of the author, a successful engineering student is expected ______.
A．to have an excellent academic record
B．to be wise and mature
C．to be imaginative with a value system to guide him
D．to be a technical genius with a wide vision
单项选择题
Why do pet dogs love performing tricks for their masters
A．To avoid being punished.
B．To show their affection for their masters.
C．To win leadership of the dog pack.
D．To show their willingness to obey.
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