题目内容
DES加密算法采用的密码技术是(38)，它采用(39)位密钥对传输的数据进行加密。
(65)
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听力原文：W: The bus is so crowded, jammed like sardines, oh, my God!
M: Can I offer you my seat？ I'm getting off the bus.
Q: What do we learn from this conversation？
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听力原文：W: Dave. I'm going to the supermarket to pick up food and drink for Saturday's picnic later. Any suggestions？
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W: Okay. And you better pick up some chicken for those who don't like hamburger or hot dogs.
M: Alright. What else？ Uh, we're gonna need some soft drinks, How about ten of those big 2-liter bottles？
W: Sounds fine, but be sure to buy a variety of drinks.
M: Okay. And what about dessert？
W: Well, maybe we could ask Kathy to make a few cherry pies like she did last time.
M: Well, I wouldn't mind that, but you know, she's been very busy working two jobs, so I'd hate to ask her, and uh... why don't you whip up some of your oatmeal cookies？ Hey, you could even ask, uh... ,what's her name... yeah that new girl, Susan, the one that moved in across the street! I bet she'd be willing to help you! She's a real knockout !
W: Nah, I don't think I could ask her... I don't know her phone number, plus...
[Door bell tings...]
M: Hey, you don't need to. She's at the door!
(23)
听力原文： Have you ever traveled on any of the giant jet airplanes？ If you have not been a passenger on one of these planes, try to imagine a jet which is more than 70 meters long and more than 5 stories high at the tail. [32]Such a plane costs at least 25 million dollars to build. It costs at least $6,000 to fill this giant with fuel. 13311nside, the jet looks more like a great theatre than a plane. It has 6 kitchens. They are all needed when the plane is full. [34]The jet can hold more than 400 passengers. Imagine that number in one jet plane. Is there any danger that the jet's engines will fail？ Fortunately, the planes appear to be quite safe. On each plane, there are twice as many engines as it needs. If two engines fail on the same side, the plane can easily use its other engines to land. [35]There are also two mechanical pilots to take charge, if the human pilots cannot fly the plane.
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For pesticides that are effective for only 2 years, their effects on the soil ends alter 2
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