( )光源一般显色指数(Ra)在80＞Ra≥60范围。
A．高压钠灯
B．金属卤钨灯
C．荧光灯
D．高压汞灯
参考答案：B,C
下列四种超高层塔式建筑平面形式， ( )对结构最不利。
A．T形 B．△形 C．Y形 D．Z形
You ______ shake hands when you meet someone for the first time in China. [ ]
A. would like to
B. are supposed to
C. want to
D. will
