Mary McCarthy's satires are couched in the prose style that has a classic precision（）.

单项选择题When the Erie Canal was built in the 1820's, it was the engineering marvel of its time（）.

A．wonder
B．dispute
C．frustration
D．model

单项选择题The National Industrial Recovery Act was designed to spur industry（）.

A．tax
B．stimulate
C．censure
D．rebuke