单项选择题
A．a new way of buying furniture B．a new way of moving from place to place C．why some people rent their furniture D．how some people rent their furniture
A．they can eat its parasites B．they depend on the sheep for existence C．they enjoy travelling with the sheep D．they find the position most comfortable
A．helped develop the creativity of a scientist B．kept a rare gift for a scientist C．prevented a scientist from thinking freely D．contributed a lot to science and technology