对角线互相平分且相等的四边形是( ).
A:菱形
B:矩形
C:正方形
D:等腰梯形
A father in the UK has a wonderful idea to send his kids to school on time. He takes his sons to school in a white tank(坦克).
某学生在学习完中国古代史后,计划写一篇小论文,你认为下列哪项标题最合适( )
To keep children away from danger,we warn parents ________ children at home alone.
男生30人,女生40人,男生占女生人数的____%,男生占全班人数的____%。