阅读理解。

Oliver: Good afternoon, Mike.

Mike: Good afternoon, Oliver. What time is it now?

Oliver: It's five fifty. Why?

Mike: My mother is ill. My father isn't at home. I must go home and cook dinner.

Oliver: I'm sorry to hear that. Can you cook meals?

Mike: Sure. And I can wash clothes, too.

Oliver: You're helpful. I can't do that, but I can clean the room.

Mike: You are also helpful! I have to go. Goodbye!

Oliver: Bye.

根据对话内容，选择正确答案。

“两岸猿声啼不住，轻舟已过万重山”描述的是（　　）

如图，圆O₁、圆O₂的圆心O₁、O₂在直线l上，圆O₁的半径为2 cm，圆O₂的半径为3 cm，O₁O₂=8 cm。圆O₁以1 cm/s的速度沿直线l向右运动，7s后停止运动，在此过程中，圆O₁与圆O₂没有出现的位置关系是（）

①我国成为世界上第五个发射卫星的国家

②我国成为第三个掌握载人航天的国家

③人工合成结晶牛胰岛素

④袁隆平“南优2号”杂交水稻选育成功。