圆形建（构）筑物应据其圆心施放（）控制线。
A.中心
B.轴线
C.外轮廓线
D.环线
E.半径
参考答案：B, C
生物体进行生命活动的主要能源物质是[ ]
A．糖类
B．脂肪
C．蛋白质
D．核酸
Days later, my brother called to say he was all right, but _______say where he was. [ ]
A. mustn't
B. shouldn't
C. wouldn't
D. mightn't
