基础巩固
能力提升
变式训练
拓展培优
真题演练
a e 
b d 
c i 
f h 
i g 
d g 
Look, it's a 
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. 
That's a cute 
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. 
I like 
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q p
s u
d t
c s
r u
n m
v w
k c
h r
s z
