为了防止发动机、发电机在运行过程中产生火花，在井场或者存有易燃易爆物品的地方引发火灾

苯海拉明中枢镇静作用机制是( )。

A．激动H₁受体

B．阻断H₁受体

C．激动H₂受体

D．阻断M受体

E．激动D₂受体

参加涉外宴请者不应该做的是()。

A.衣着整洁

B.女士化妆

C.穿工作装出席

D.客随主便

An equity analyst needs to select a representative sample of manufacturing stocks. Starting with the population of all publicly traded manufacturing stocks, she classifies each stock into one of the 20 industry groups that form the Index of" Industrial Production for the manufacturing industry. She then selects a number of stocks from each industry based on its weight in the index. The sampling method the analyst is using is best characterized as:（）

A. data mining.

B. nonrandom sampling.

C. stratified random sampling.

Do you want to have a close friend? Do you know how to make a good friend? Now, let me tell you. Before you make friends, you have to decide who you want to be your friends. Most people like to have friends who like to do the same kind of things they do.

The quickest way to make a friend is to smile. When you smile, people think you are friendly and easy to talk to. It may not be easy at first to smile, but remember most people will stay away from a scared or angry looking face.

One easy way to start a conversation with someone is to say something nice about him. Think about how great you feel when someone says something nice to you. Doesn’t it make you want to keep talking to that person?

Ask your new friends questions about themselves. Who’s their favorite singer, where do they live, what do they do after school are all good questions to start a conversation. Make sure you have something to add to the conversation, too. When someone asks you a question, do have an answer for them. There’s nothing that will stop a conversation quicker than a shrug (耸肩) for an answer.

Kids who show an interest in other kids and who are kind and friendly make good friends. Remember, everyone wants to be around people who like to do similar things and people who are nice to them.

小题1:What does the underlined word scared( in para.2) mean?

A．holy

B．frightening

C．happy

D．sad小题2:The main idea is _________.

A．how to start a conversation

B．how to praise a person

C．how to make friends

D．the importance of making friends小题3:What kind of people are easy to become friends?

A．who are happy every day.

B．who often speak ill of others.

C．who are good at communicating .

D．who share the same interest.小题4:If a person shrug , what does he/she mean?

A．being very proud

B．making no answer

C．being very happy

D．be humorous小题5:Most people enjoy talking to one _______.

A．who speaks highly of them

B．who are very out-going.

C．who is always smiling

D．who points out their shortcomings

目前，对于3G标准产品用户，暂不提供的业务有（）

A.本地通话

B.省内漫游通话

C.省级漫游通话

D.港澳台漫游通话

E.国际漫游通话