下列字母书写格式正确的是 ____。
#16885
A
B
C
D
推荐题目
Pandas like eating _____ and elephants like eating ____.
#17216
A
leaves, grasses
B
leaves, grass
C
leaf, grass
D
leaf, grasses
It’s necessary for human beings to breath _______ and plants can produce it.
#17259
A
CO2
B
H2
C
O2
D
N2
