①巩固公有制的主导作用            
②进一步提升国有经济竞争力

③取消国有经济对国民经济的控制力   
④促进各种所有制经济依法平等使用生产要素

补全下列对话。

  Sally：How was your Labour Day holiday，Rick?

  Rick：It was____．

  Sally：Where did you go?

  Rick：I went to Sanya with my____．

  Sally：How did you go there?

  Rick：We went there by____．

  Sally：Did you go____there?

  Rick：No．The weather was a little cold．We went____there．It was fun!

  Sally：Sounds interesting!

如图所示，电荷量为q的正电荷位于电场中的A点，受到电场力为F．若将该电荷换为电荷量为 $\frac{q}{2}$ 的负点电荷．则A点电场强度E的大小和方向分别是（　　）

—Excuse me. Where is        school library? —This way, please.