太阳辐射总量具有与（）、（）的特点，这是形成气候带的主要原因。
参考答案：纬线圈平行、呈带状分布
During the period of recent terrorist activities, people _____ not to touch and unattended bag. [ ]
A. had always been warned
B. were always being warned
C. are always warning
D. always warned
从狭义上说，指数体系的若干指数在数量上不一定存在推算关系。（）
