甲状腺大部切除术后最急的并发症是
A．呼吸困难和窒息B．声音嘶哑C．手足抽搐D．甲状腺危象E．饮水呛咳
参考答案：E
- Some students often drop litter carelessly in our school. What can we do?
- We can _______ some signs to remind them not to do that again.
A．put up
B．put off
C．put away
D．put on
无需腐熟可直接施用的肥料有（）
A、复合肥
B、厩肥
C、动物粪肥
D、饼肥
