A:Frank's father was hardworking and very responsible.
B:Frank's father drove him to school everyday when he was 12.
C:Frank regretted refusing his father's kiss very much.
D:Frank didn't think the good-bye kiss an embarrassment anymore.
正方形有____条对称轴,长方形有____条对称轴,圆有____条对称轴。
小明的书桌上铺有一块玻璃板,晚上小明在台灯下学习的时候,桌面上的玻璃会”发出”刺眼的亮光,为了保护眼睛,采用最简单、效果最好的方法是( )
在以下关于人类起源和发展的说法中,正确的是( )