What does Laura need at the moment?
A:Blame.
B:Encouragement.
C:Help with her chemistry.
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千沟万壑,支离破碎是哪个地形区的特点( )
几个同学用弹簧拉力器比试臂力,各人都用同一拉力器,拉力器上有3根弹簧,结果几个人都能把手臂撑直,比较这几个同学所用的拉力 ( )