- I think students can have mobile phones to help with their studies.
- _______. They often use them to play games.
A:I think so
B:I don't agree
C:No problem
D:That's a good idea
在Rt△ABC中,∠C=90°,Rt△ABC绕点A顺时针旋转到Rt△ADE的位置,点E在斜边AB上,连结BD,过点D作DF⊥AC于点F.
近几年,由于我市大力推广植树造林,不断扩大绿化面积,前几年近乎销声匿迹的雉鸡、喜鹊等多种鸟类又重返家园.这种现象主要体现了()
读图,(阴影部分表示黑夜),据此回答下题.