单项选择题
A．To tell how "high tech" and "state of the art" have developed. B．To give examples of "high tech". C．To tell what "high tech" and "state of the art" are. D．To describe very modem technology.
A．lawyer B．client C．tenant D．case worker
A．man never made sounds B．man made animal sounds C．man used to be like animals to make sounds D．man learned from the animals to make sounds