任务型阅读　　　

The moon landing

　　It's always been man's dream to fly like a bird in the sky. Back in 1865,a French writer once wrote about man's landing on the moon on a special airplane with three people inside, and the first person to touch the ground on the moon would be American. That was considered (被认为) to be a crazy (疯狂的) idea at that time. Over one hundred years later, on July 20,1969,however,this impossible dream did come true.

　　It was a big day in the history of the 20th century. On that day, a special airplane took three brave (勇敢的) men from Cape Kennedy at a speed of 35,533 feet per second. The trip to the moon took 103 hours and 30 minutes. In fact, it was the first time that man ever ”walked” in outer space. On the trip, two of the spacemen spent two hours on the moon walking like flying, and the other stayed in the spaceship. They studied the appearance of the moon. Four days later, the spaceship Apollo 11,returned to the earth and the astronauts were welcomed by people around the country. The man who took the first step, Neil Armstrong, said, “That's a small step for a man, one giant leap for mankind.”This has been said again and again in every language around the world since then.

　　根据短文内容，回答下列问题。

下列有关需氧呼吸的叙述，错误的是（　　）

己知铝的密度为2.7×10³kg/m³，小明的父亲外出时买了一个用铝材料制造的艺术品球，用天平测得球的质量是594g，体积为300cm³．请你帮助完成下列问题：

（1）判断此球是否为实心的．

（2）若是空心的，则空心部分的体积为多少cm³？

（3）若在空心部分注满水，则注入水的质量为多少？

解答“已知 $x-y=2$ ，且 $x>1$ ， $y<0$ ，确定 $x+y$ 的取值范围”有如下解，

解：∵ $x-y=2$ ，

∴ $x=y+2$ ．

又∵ $x>1$ ，

∴ $y+2>1$ ．

∴ $y>-1$ ．

又∵ $y<0$ ，

∴ $-1<y<0$ ， $\cdots$ ①

同理得： $1<x<2$ ． $\cdots$ ②

由① $+$ ②得 $-1+1<y+x<0+2$ ．

∴ $x+y$ 的取值范围是 $0<x+y<2$ ．

请按照上述方法，完成下列问题：