关于钠及其化合物的叙述中,正确的是 ( )
A.钠是银白色金属,密度很大。
B.将金属钠放到水中不反应。
C.金属钠在空气中燃烧,生成氧化钠。
D.过氧化钠可用作潜水艇中的供氧剂
答案:D
We are invited to a party __________in our club next Friday.
A.to be held
B.held
C.being held
D.holding
I’m going to Shanghai on business this afternoon, so I have to _______ my things now.
A.turn up
B.set up
C.take up
D.pack up