原式=22×22-4+3
=2-4+3
=1.
The children are playing in the _____ of the beach.
A.sand
B.sands
C.sandes
D.sandy
典型麻疹的出疹顺序是()
A.先面部→四肢→躯干
B.先躯干→四肢→手脚心→头面部
C.先耳后→颈部→面部→躯干→上肢→下肢→掌心→脚心
D.先前胸→上肢→背部→下肢→头面部
E.先四肢→颈部→面部→躯干