单项选择题

There have been __________ social and demographic changes in the country.

A．) abrupt
B．) monumental
C．) massive
D．) lousy

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多项选择题

What changes does information system technology generally focus on?
A、Attitudes
B、Management
C、Organizational policy
D、Behavior

单项选择题

-般气缸套采（）。 A.
灰铸铁 B.
低碳钢 C.
中碳钢 D.
高碳钢