-Look at the sun! It's too hot today.
-Yes. Why not __________ your coat?
A:take off
B:take away
C:take out
D:take up
实验室制取氢气的步骤,正确的顺序是( )
①检查装置的气密性 ②加入稀硫酸 ③加入锌粒 ④收集氢气
下列去括号结果正确的是( )