We are convinced that we are on the （） of an important discovery.

单项选择题All the parts of these washing machines are （）, so that it is very convenient tO replace them.

A. normalized
B. modernized
C. mechanized
D. standardized

单项选择题The man had a rather shady occupation and made a lot of money within a short period of time（）

A. profitable
B. comfortable
C. honorable
D. dishonest