单项选择题
A．used words B．followed many things in nature C．lifted heavy things D．grunted like a pig
A．American stores could provide new kinds of products to people. B．High tech describes a technology that is not traditional. C．"State of the art" is not as popular as "high tech". D．A modem plough pulled by oxen is "state of the art".
A．courage B．enthusiasm C．interest D．sense