—We'd better invite Jim and Jack to the party tonight.

—Yes, _____? I'll give them a call right now.

句型转换1.How far  is it from your home to the museum?
2.My cousin won't go to see a doctor this afternoon.
3.Remember to turn off the lights when you leave the office.
4.Tom sits between Jane and Kitty.
5. I hope to have a house of my own some day.

如图所示，点A₁、A₂、A₃在x轴上，且OA₁=A₁A₂=A₂A₃，分别过点A₁、A₂、A₃作y轴的平行线，与反比例函数y= $\frac{k}{x}$ （x＞0）的图象分别交于点B₁、B₂、B₃，分别过点B₁、B₂、B₃作x轴的平行线，分别与y轴交于点C₁、C₂、C₃，连接OB₁、OB₂、OB₃，那么图中阴影部分的面积之和为 $\frac{49}{18}$ ，则k的值为____．

函数y=cos2x﹣2cosx+1的最小值和最大值分别是（　　）

顺次连接矩形ABCD各边中点所得的四边形必定是（）