若函数$f\left(x\right)=\sin \omega x\left(\omega >0\right)$在区间$0,\frac{\pi }{3}$上单调递增，在区间$\frac{\pi }{3},\frac{\pi }{2}$上单调递减，则$\omega$=（   ）

如图，已知楼AB高36米，从楼顶A处测得旗杆顶C的俯角为60°，又从该楼离地面6米的一窗口E处测得旗杆顶C的仰角为45°，求该旗杆CD的高．（结果保留根号）

根据短文理解，选择正确答案。

    Do you want to be a reporter? Are you a good English writer who loves the news? We're looking for 100 students from all over the world. They will join the BBC Kid Reporter team for the 2016－2017 school year.

    In the past, BBC Kid Reporters:

★Interviewed (采访) some famous people.

★Wrote news stories for BBC For Kids.

★Talked about their work on television.

Next year our team will go on to report local news stories for BBC For Kids magazine (杂志) and bbcforkids.com.

How to Enter

    Visit www. bbcforkids.com and fill in the entry form (报名表). Be sure to read the rules and share them with your parents, who must sign your form. You must finish the form by July 9, 2016. You must be OVER 13 years of age. Good luck!

秦岭﹣淮河不是下列那两个地区的分界线（    ）