下面哪项不属于雄激素的生理作用？（） A.促进蛋的合成的作用 B.促使子宫发育及肌层

同步发电机励磁自动调节的作用之一：应在并联运行的发电机之间_________。

写出图中叶片各结构的名称，并完成各题．

（1）将各部分结构名称写在横线上：

①______，②______，③______，

④______，⑤______，⑥______．

（2）叶片的叶肉部分是指______和______，（填序号）叶肉细胞中有许多小颗粒，叫做______，其中含叶绿体最多的是______，所以叶片正面颜色较深．

（3）叶脉除具有______功能外，还起着______功能．

（4）表皮上有______，是气体交换和水分散失的门户，由成对______细胞构成．

阅读理解

     I wear what I feel is comfortable and convenient. Decades ago, my 10-year-old Italian nephew

asked me for jeans from Canada when I visited.

     Upon seeing them, he claimed they were not Levis. "What does Levis mean?" I asked naively.

     Later, I was preparing to come to China when my Sichuan friend ordered jeans for her daughter.

"You mean Levis, I guess?" "No, Benetton," she said.

     Living in China I realize the effect brands have on people here. Once I bought a pair of sandals

because I needed sandals. Many people told me, "Wow! You wear them? You have money!" I didn't

know why they thought 150-yuan ($22) sandals were for wealthy people. I had never heard that brand

name (which I can't remember) before.

     While visiting my family in Canada, we were talking about fake products(假冒商品) in China. As a

writer, I don't accept that readers pirate(盗版) my books and I would consider myself a thief if I ever

buy them. A young relative asked, "What about your purse?"

     "What's the problem with my purse?" I countered.

     "It's a Yves Saint-Laurent; do you mean you paid the full price?"

     "How can you think I bought a YSL? I bought it because of size, color and price."

     She picked up the purse and pointed to the steel YSL on it. Believe it or not, I had not noticed it till

then.

     When Pearl Market used to sell watches, I happened to need one and went there for the large

choice they offered. What I wanted was a watch to see the time, I insisted.

     They had no Chinese brands, only Cartier, Citizen, Seiko, Rolex. Having refused several ming pai

copies, I was leaving without buying when I saw a black one.

     "Diesel, what a strange name for a watch," I thought. Wasn't diesel something that went into a gas

tank? The business deal went quickly; I offered 35 yuan and left with the watch.        

1. What's the author's attitude towards fake products?

A. He thinks they are of good quality.

B. He supports fake products.

C. He believes they are symbols of status.

D. He is strongly against fake products.

2. Why did the author go to Pearl Market to buy a watch?

A. Because the watches here were cheaper.

B. Because there were many famous brands.

C. Because he might make a better choice here.

D. Because he wanted to buy a fake watch.

3. What point does the author want to make in the passage?

A. Brands don't always tell the truth.

B. Fake products should be banned.

C. Following fashion makes much sense.

D. True beauty comes from one's actions.

缺氧时最先发生改变的细胞是()

A．神经细胞

B．毛细血管内皮细胞

C．小胶质细胞

D．星形胶质细胞

E．少突胶质细胞

简述数据通信系统的组成及其工作模型。