A:大气的反射具有选择性
B:大气的散射作用对波长较长的红光最明显
C:大气的吸收具有选择性
D:大气的反射、散射、吸收均无选择性
35+4=____
81+9=____
A:Wow! What a great model plane! Is it yours,Jack?
B:Yes,it's mine.
A:____
B:For two days.
B:At Green Store。
B:It's six dollars.
B:I've given it to Peter.
B:Because he likes it a lot.
A.How much is it?
B.Why did you give it to Peter?
C.How long have you had it?
D.Where did you buy it?
E.Why are you selling it?
F.Where's your old model plane?
G.Can I have a look at your old model plane?