新民主主义社会的主要矛盾是（） A.农民阶级同资产阶级的矛盾 B.人民群众内部矛盾

写出下列物质在水溶液中的电离方程式：

①Ca（OH）₂：______；

②KHSO₄：______；

③H₂SO₄：______．

阅读理解。

     I hated dinner parties. But I decided to give them another shot because I'm in London. And my friend Mallery invited me. And because dinner parties in London are very different from those in New York,

     "I'm having a dinner party" means: "I'm booking a table for 12 at a restaurant and we'll be sharing the

cheque evenly (平均地), no matter what you eat." In Manhattan there is always someone who leaves

before the bill arrives. They'll throw down cash, half of what they owe, and then people like me, who

don't drink, end up paying even more. But if you try to use the same trick, the hostess will shout: "Where

are you going ?" And I cannot say I have somewhere to go because everyone knows I have nowhere to

go.

     But in London, dinner parties are in people's homes. Not only that, the guests are an interesting mix.

The last time I went to one, the guests were from France, India, Denmark and Nigeria; it was like a

gathering at the United Nations. In New York, the mix is less striking. It's like a gathering at

Bloomingdatle's, a well-known department store.

     For New Yorkers, talking about other parts of the world means Brooklyn and Queens in New York.

But at Mallery's, when I said that I had been to Myanmar recently, people knew where it was, while In

New York people would think it was a usual club.

1. What does the word "shot" in Paragraph 1 probably mean?

A. Choice      

B. Try      

C. Style      

D. Goal

2. What does the writer dislike most about dinner parties in New York?

A. There is a strange mix of people.            

B. The restaurants are expensive.

C. The bill is not fairly shared.                

D. People have to pay cash.

3. What does the author think of the parties in London?

A. A bit unusual                            

B. Full of tricks  

C. Less costly                              

D. More interesting

4. What is the author's opinion of some New Yorkers from her experience?

A. Easy-going.    

B. Self-centered.    

C. Generous.    

D. Conservative.

3岁男孩，自幼蹲位排尿，阴茎发育小，向下弯曲， * * 口位于阴茎根部与阴囊交界处，双侧阴囊内可触及正常睾丸。如为 * * 下裂，则其分型标准是（）

A.染色体检查

B.合并畸形多少

C. * * 外口位置

D.阴茎弯曲程度

E.血睾酮水平

具有技术简便、费力不多、应用面广和资料全面的优点，且在我国广泛采用的计时观察方法是( )。

A．测时法

B．写实记录法

C．工作日写实法

D．混合法

大型游艺机在运行中一般都有一些振动，在实际运行中，螺栓、档板、销轴等松动现象时有发生，因此重要的连接件，一定要采取防松措施。如图是（）防松方法。

A.弹簧垫圈

B.双螺母

C.轴端挡板固定销轴