A、To encourage people to think more about nature. B、To explain how the great theory came out. C、To show the necessity of being l

W: Hey George, take a look at this article. It says several major airlines are considering allowing people to use their cell phones while in the air.
M: Oh no, really? That’s one of the worst ideas I’ve ever heard.
W: Oh? Why do you feel that way?
M: Well, I fly for business quite frequently and a plane, is now one of the last places where I don’t have to hear people chatting on cell phones. I really enjoy the peace and quiet.
W: But it would be so convenient if we were able to make calls during long flights. Just think of how much work we could get done!
M: I think perhaps people are taking the idea of multitasking a little bit too far. I get calls from people on my cell phone and they say things like "Where were you? I’ve been trying to reach you all afternoon. " Well, I was on the golf course and I turned off my cell phone. Is that a crime?
W: I see what you mean. We are so connected these days that there is hardly any time for peace and quiet. I’ll tell you a secret that’s a little embarrassing: I leave my cell phone on all night long, just in case a call comes in.
M: I know lots of people who do that. They say, "What if there is an emergency?" I guess I can understand why someone would feel that way, but I think sometimes we need to turn off our cell phones and tune out all the noise.
W: I can see your point.(3)I get really frustrated by businesspeople that seem to never put down their cell phones. I have to listen to their long, boring conversations and there is really no way I can tune it out.
M: So people take calls every 2 or 3 minutes! Most of the time I think business conversations can probably wait until you get back to the office.
W: That’s true.(4)We might actually be making more work for ourselves by this constant need to stay in touch.
M: If they allow cell phones on airplanes, we’re going to have to hear even more hours of endless chatter.
W: We really don’t get a lot of quiet time these days.
M: Yeah.(5)We sometimes need to be alone in order to think. Many famous people discovered important things when they were just sitting silently by themselves. You know the story about Isaac Newton, right?
W: Yep. He came up with the theory of gravity while sitting in a field and watching an apple fall from a tree.
M: He probably wouldn’t have had time to think about gravity if he was talking on his cell phone.
W: That’s right.
1. What is the man’s opinion about using cell phones on a plane?
2. Why does the woman leave her cell phone on all night?
3. What does the woman think about business conversations?
4. What does the woman say about the constant contact by phones?
5. Why does the man mention the story of Newton?