A joke is something__________makes you laugh.

听力原文：M: Anyway, Jessica, I think whether you enjoy having friends or not depends on what your definition of friendship is.

W: Right,' maybe my expectations are just too high. What's your definition of friendship?

M: Well, real close friends are very rare. I only have a few of the kind of friends who I make the effort to keep in touch with.., and I'll probably keep in touch with them forever.

W: Me too. And the only way I'll make more of those kinds of friends is by meeting more people.

M: Absolutely. I'm just having so much fun meeting all different kinds of people with different backgrounds.

W: So you seem to be saying that you're happier now that you are more social.

M: Yes, definitely. Even though my life at college is not perfect, the fact that I have an active social life has really made me a lot happier.

W: But why do you think so?

M: Well because I feel a part of something. I feel like there's a group of different people who are in a similar situation with me.

W: You mean that you have things in common to talk about?

M: Yes. Not only that but we can share our experiences and get to know that other people share our feelings.

W: Right. That makes a lot of sense to me.

M: Speaking of friendship, do you want to come with me to our school auditorium this weekend to see a performance or a film or something?

W: Sure, that would be fun.

M: Great. I'll give you a call on Saturday and we can figure something out.

W: Ok, super. I'll talk to you later.

(26)

A．Friendship results from high expectations of people involved.

B．Real close friends are a rarity.

C．Friendship is a result of mutual trust and respect.

D．Friendship is based on similar interests and tastes.

The paperless office is not a dream, it is a joke. Today more gadgets(小器具) are devoted to spattering more paper with more ink than ever before. At last a Japanese manufacturer of office equipment, Ricoh, is trying to reverse the trend. (46)The age of the recycling non-violent shredder may be about to dawn.

(47)The new machine sprays on a chemical to loosen the toner&39;s grip, applies a little heat and then uses a sticky roller to peel the toner(增色剂) off,

Using this technology, a single sheet of paper can be recycled 10 or 20 times, depending on its durability. And as well as eliminating bins full of waste paper, the machine could silence &39;the shredder.(48)The result would not fool the experts in a forensic(法医) laboratory, but is might well suffice for low-level security.

(49)The prototype cleans only three pages a minute. Ricoh has yet to show it can make erasing old paper cheaper than buying new. And only the toner is removed: the ma chine cannot wipe out marks made by dot matrix printer or thermal-paper fax machines. (50)This means that text or figures produced with a laser printer could be altered, but letterheads and signatures on the same piece of paper would be left intact.

(46)

A. More work is required.B. Anyone concerned about secrecy could erase his message rather than reduce it to tangles of shredded paper.C. He has developed a machine that takes in printed paper and spits out clean white sheets.D. The new machine can tear paper sheets into pieces.E. Pen strokes and impressions made with ordinary printing presses are also immune.F. Most photocopiers, laser printers and plain-paper fax machines make their marks with toner, which is melted on to the surface of the paper.

(47)

A. More work is required.B. Anyone concerned about secrecy could erase his message rather than reduce it to tangles of shredded paper.C. He has developed a machine that takes in printed paper and spits out clean white sheets.D. The new machine can tear paper sheets into pieces.E. Pen strokes and impressions made with ordinary printing presses are also immune.F. Most photocopiers, laser printers and plain-paper fax machines make their marks with toner, which is melted on to the surface of the paper.

(48)

A. More work is required.B. Anyone concerned about secrecy could erase his message rather than reduce it to tangles of shredded paper.C. He has developed a machine that takes in printed paper and spits out clean white sheets.D. The new machine can tear paper sheets into pieces.E. Pen strokes and impressions made with ordinary printing presses are also immune.F. Most photocopiers, laser printers and plain-paper fax machines make their marks with toner, which is melted on to the surface of the paper.

(49)

A. More work is required.B. Anyone concerned about secrecy could erase his message rather than reduce it to tangles of shredded paper.C. He has developed a machine that takes in printed paper and spits out clean white sheets.D. The new machine can tear paper sheets into pieces.E. Pen strokes and impressions made with ordinary printing presses are also immune.F. Most photocopiers, laser printers and plain-paper fax machines make their marks with toner, which is melted on to the surface of the paper.

(50)

A. More work is required.B. Anyone concerned about secrecy could erase his message rather than reduce it to tangles of shredded paper.C. He has developed a machine that takes in printed paper and spits out clean white sheets.D. The new machine can tear paper sheets into pieces.E. Pen strokes and impressions made with ordinary printing presses are also immune.F. Most photocopiers, laser printers and plain-paper fax machines make their marks with toner, which is melted on to the surface of the paper.

请帮忙给出每个问题的正确答案和分析，谢谢！

What is the professor's opinion of Picasso?

A．Picasso was probably playing a joke by offering drawings for sale.

B．At the end of his career, Picasso may have chosen drawing because it was easy.

C．Picasso's drawings required the confidence and skill of a master artist.

D．Cave drawings were the inspiration for many of Picasso's works.

Before you start taking digital photos you'll need to make sure that there's some film in the camera. With a digital camera the "film" isn't a plastic roll but some computer memory, and it can get full of pictures just the same. Most digital cameras will let you take twenty or thirty pictures before they fill up, and once they do, you have to either get rid of some photos or copy them to your computer to free up space. Or, if your camera uses special computer memory like Compact Flash or a Memory Stick, put in a new card. Don't forget to keep the old one safe.

You'll also need to check the batteries. Digital cameras use power, and if you've got a camera that takes normal disposable(一次性的) batteries you'll find it eats them really fast. Better to get rechargeable ones or—if you can afford it—go for a camera that has its own rechargeable battery pack built in. But whatever the power source, make sure that you've got enough juice(电) for the party or day on the beach.

A digital camera holds your photos as computer files, and before you can do anything with them apart from looking at them on the camera's own little screen you generally need to copy them to your computer. Some cameras can be plugged straight into your TV so that you can have a slideshow(放映) of your pictures—it's called video output, and you'll need a special cable for it. But mostly you'll want to copy your pictures to your computer, and probably print them out.

The film of the digital camera ______.

A．can't get full of pictures

B．is a plastic roll

C．is a computer memory

D．is a picture