下列不属于西周时期特权贵族阶层的是[ ]
A．诸侯
B．卿大夫
C．士
D．平民
答案：D
The view ______ many scientists hold is ______ too much emission of carbon dioxide is destructive.[ ]
A. what ,that
B. that, which
C. that, that
D. which, which
