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A．He dislikes his present job.B．He wants a higher salary.C．He wants to have more diver
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RTCA, an organization which advises the aviation(航空) industry, has recommended that all airlines ban(禁止) such devices from being used during "critical" stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights.
The difficulty is predicting how electromagnetic fields might affect an aircraft's computers. Experts know that portable devices emit radiation which affects those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not.
The fact that aircraft may be vulnerable(易受损的) to interference raises the risk that terrorists may use radio system in order to damage navigation equipment. As worrying, though, is the passenger who can't hear the instructions to turn off his radio because the music's too loud.
The passage is mainly about______.
听力原文：W: Excuse me sir, but I have to use your phone. There's been an accident and I have to call an ambulance.
M: Well, I suppose that'll be all right. This phone is usually for office use only, but since it's an emergency.
Q: Why did the woman sound urgent？
(14)
听力原文：W: This doesn't look at all familiar. We must be lost, we'd better get some directions.
M: Let's pull in here. While I'm filling the tank, you ask about the directions and get me a soft drink.
Q: Where will the man and the woman go for assistance？
(13)
听力原文：M: Holly, is it possible to borrow your notes？ I'll return them tomorrow.
W: Sorry, but I usually go to the cafeteria and review them. Say, how about copying them over in the library？
M: OK. I think I've got enough coins for the machines.
W: No problem. But I don't understand why you need my notes, Carter; you haven't missed any classes.
M: Weekday mornings, I'm a cashier at a coffee shop downtown. After work, I come directly to school!
W: Wow, you're probably exhausted!
M: That's exactly why I want to borrow your notes. I've been nodding off during class, so my notes aren't very good.
W: Well, here's Professor Lahelle. How are you feeling？
M: I'm usually awake at the beginning. But after thirty minutes into class, I'm having trouble keeping my eyes open.
W: Listen. I need someone to study with, and you need someone to keep you awake; want to be study partners？
M: Yeah, I'd sure appreciate it.
W: OK, let's start today at the library. We're going there anyway, and I don't have to go to the cafeteria.
M: Sounds good. Oh, no, it looks like he's brought along some more of his slides; elbow me if I start drifting off.
W: I'm afraid I Won't be very helpful. His slides make me sleepy too!
(20)
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