=﹣9﹣(﹣8)
=﹣9+8
=﹣1.
改错
On their way to home , they found a small cat in the tree.
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如图,能判断直线AB∥CD的条件是( )
下列省区中,水土流失较严重的有( )
①陕西②山西③黑龙江④西藏