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类风湿性关节炎的基本病理变化有哪些?

答案

参考答案:

类风湿性关节炎最常累及小关节及关节以外组织或器官的结缔组织,属于结缔组织疾病,其主要病变有以下3种:

(1)弥漫性或灶性淋巴细胞和浆细胞浸润,可伴淋巴滤泡形成。

(2)血管炎:血管内皮细胞增生,管腔狭窄和阻塞,血管壁纤维素样变性或纤维素样坏死,血管周围淋巴细胞及浆细胞浸润。

(3)类风湿肉芽肿:具有一定的特征性,中央为大片的纤维素样坏死,周围有呈栅状或放射状排列的增生的组织细胞包绕,再外围为增生的毛细血管及成纤维细胞。

阅读理解

阅读理解。

     Ivan Fletcher loves crazy inventions. He writes a weekly magazine column (专栏) called Unbelievable

Inventions.

     "One of my favorite inventions is the Butter Stick. It looks like a glue, but it's butter. You spread it on

the bread without using a knife," he says. "Another cool invention is Duster Slippers for pets. You put these

special shoes on your dog or cat. As the animal runs around your house, it collects dust from the floor. Very

useful!" A lot of these inventions come from Japan-the home of the crazy invention.

     Ivan says that the British also invent a lot of crazy things. "The other day I found an invention called a

Cat Seat Saver," he says. "The Cat Saver looks exactly like a sleeping cat-but it isn't real. You put it on your

seat if you have to go to the rest room. No one will sit in your seat because they think there's a sleeping cat

on it. Pretty cool!"

     However, does anyone buy these things? Yes. Lucy Wade from the shopping website crazygadgets.com

says that their customers are young, professional people.

     "They buy these small things mostly for fun," she says. "They are usually looking for a present for a

friend's birthday or a silly girl for someone they work with."

     If you have an idea for an amazing invention, send it to Lucy at lucyw@crazygagets.com.

     Fish Radio

     This useful radio is completely waterproof, so you can listen to it in the shower. Simply stick on the

bathroom wall and sing along to your favorite songs as you shower!

     Watch Your Back Mirror

     Don't get caught surfing the Internet or sending e-mails to your friends. Stick this mirror to your computer

screen and you'll be able to see when the boss is coming!

1. One of the inventions that Ivan Fletcher likes best is _____. 

A. the Fish Radio

B. the Butter Stick

C. the Watch Your Back Mirror

D. the Cat Seat Saver

2. You put the Duster Slippers _____.

A. on your pet's feet

B. on your feet

C. on your pet's head

D. on the floor

3. The Cat Seat Saver _____.

A. is a special mirror

B. is a chair for cats

C. looks like a real cat

C. collects dust from the floor

4. Why is the Fish Radio useful?

A. It is shaped like a fish.

B. It sings your favorite songs.

C. You can listen to it in the shower.

D. It is small enough to put in the bathroom.

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