长江沿江地区是一个典型的“( )状”区域.
A:带
B:环
C:饼
D:线
Our school is so famous that _______ people come and visit it every term.
人体呼吸系统的组成按顺序排列应当是( )
12+16 =____
34−35 =____
23−25 =____
1−12−14 =____