改同义句.Your brain will work worse unless you practice it.This walkman cost me four hundred yuan

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改同义句.Your brain will work worse unless you practice it.This walkman cost me four hundred yuan

1.Your brain will work worse unless you practice it.你的大脑除非你联系它,他才会工作
改为同义句:Your brain doesn't work worse until you pratice it.
2.This walkman cost me four hundred yuan.这个随身听花费了我400元
改为同义句:It takes me four hundred yuan for the walkman.

if you don't practice you brain,it wil work worse.
i paid four hundred yuan for the walkman

if you don't practice ,you brainwil work worse.
i paid four hundred yuan for the walkman