某男子为了解国际马拉松赛事的精彩花絮,擅自在实行空域管制的赛道上空进行航拍.一辆摩托车主未戴头盔驾驶,被处罚时十分激动,辩称“不戴头盔的人多呢”.这两件事共同标明他们( )
①应做到防微杜渐,远离违法犯罪
②要认识到权利和义务具有一致性
③应该学会排解自己的不良情绪
④没有能够克制盲目的从众心理
⑤珍爱生命,延伸了生命的价值
A:①④⑤
B:③④⑤
C:①②
D:②③
如图,从点O出发的五条射线,可以组成( )个角.
某同学在用弹簧测力计测量一物体的重力时,错将物体挂在了拉环上,如图所示.当物体静止时,弹簧测力计的示数为8N,则物体的重力为()
A. We took pictures of the beautiful countryside.
B. We rode a bike for three people
C. In the afternoon, Mum ate some bad fruit and didn't feel well.
D. We bought some gifts and ate some delicious food
E. We dressed up and made a funny play
F. Max liked Robin very much, but Robin didn't like it.
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设集合A=x|x-1x+1<0,B=x|x-1<a,则“a=1”是“A∩B=∅”的( )