单项选择题

Why were cracks in old houses not a big concern

A．Because indoor cleanliness was not emphasized.
B．Because energy used to be inexpensive.
C．Because environmental protection was given top priority.
D．Because they were technically unavoidabl

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单项选择题

The author's experience shows that he was ______.

A．creative
B．ambitious
C．unrealistic
D．irrational

单项选择题

According to the author, by interacting with people who study liberal arts, engineering students can ______.

A．balance engineering and the liberal arts
B．receive guidance in their careers
C．become noble idealists
D．broaden their horizons