蓝莓组织 $\stackrel{①}{\to }$ 愈伤组织 $\stackrel{②}{\to }$ 长出丛 $\stackrel{③}{\to }$ 生根 $\stackrel{④}{\to }$ 移栽成活

根据短文选择正确答案

    Today is a holiday. Sam is playing football in the park. Amy is playing the guitar（吉他）under the tree. Daming is flying a kite. Lingling isn't here. She visits her grandma today. The children are playing merrily. They think life is like a dream.

如图，用水平力F将重力等于G的木块压在竖直墙面上，使木块静止．下列判断正确的是（   ）