单项选择题

With which of the following subjects is the passage mainly concerned

A．Types of mass transportation.
B．Instability of urban life.
C．How supply and demand determine land use.
D．The effect of mass transportation on urban expansion.

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单项选择题

I was to have made a speech if ______.

A．I was not called away
B．nobody would have called me away
C．I had not been called away
D．nobody called me away

单项选择题

On no account ______ borrow money from friends, and still less dependent on the favors of rich relatives.

A．I would, I would
B．would I, would be
C．would I, would I be
D．I would, would I be