在数列{an}中，a1=0，an+1=3+an1-3an，则a2013=（ ）A

在证券公司中确定自营业务规模以及自营业务的最高决策机构为( )。

A．股东大会
B．董事会
C．监事会
D．决策委员会

Most of us would say that the older we get, the less we look forward to celebrating another birthday. For children, though, a birthday is that one occasion each year when they are the center of attention all day long.

It’s not surprising, then, that children’s birthday parties have turned into big business in America. Kids—or more likely their parents—often try to outdo one another in putting on the most extravagant birthday party. In the past, you might have hired a man with a horse to come by and give everyone horse rides. Today, you can hire an entire petting zoo’s or a truck filled with animals from abroad.

Barb Hill, a mother of two girls, doesn’t hold extravagant (奢侈的) parties, but she says she does feel pressure to come up with new ideas each year. Her daughter Fiona celebrated her most recent birthday, her eighth, at a sporting-goods store. The kids enjoyed the climbing wall, as well as the pizza and cupcakes. “They always want to do something that nobody else has done yet,” Barb says. You also have to decide how many guests to invite, and if you’re celebrating at a place other than home, that means figuring out how to transport everyone.

William Doherty, a professor at the University of Minnesota, recently started a project called Birthdays without Pressure. Its website (www. birthdayswithoutpressure.org) gives parents the resources to make kids’ birthday parties less stressful and more fun for all. “Our goal was to start a local and national conversation about what’s happened to birthday parties,” Doherty told me. “We’ve succeeded beyond our expectations—tens of thousands of parents are viewing our website, contacting us and taking our online quizzes.”

In the end, most parents would agree that the best parties are usually the ones where the kids have time to hang out and play with each other. After all, isn’t what being a kid is all about?

1. The purpose of this passage is to tell us_________.

A.all the children look forward to celebrating their birthday

B.the children’s birthday parties have turned into big business in America

C.parents would like to make children’s birthday parties less stressful and more fun for all

D.parents don’t know how to hold children’s birthday parties

2. Which of the following sentences is TRUE ______.

A.The girl didn’t enjoy the party held by her mother.

B.The project called Birthdays without Pressure is popular with parents.

C.Children look forward to their birthday parties because they like extravagant parties.

D.Parents feel like hiring an entire petting zoo for their children.

3. The aim of the project called Birthdays without Pressure is to______.

A.attract parents to view the website

B.provide resources for making kids’ birthday parties

C.release parents’ stress of organizing children’s birthday parties

D.hold conversation about what’s happened to birthday parties

4. The best title for this passage may probably be ______.

A project called Birthdays without Pressure

B.Children enjoy their birthday parties

C.  How to hold children’s birthday parties

D.  How children feel about their birthday parties

肾交感神经起源于（）

A.胸₁～腰段脊髓

B.胸₂～胸₄

C.胸₄～胸₆

D.胸₄～胸₁₀

E.胸₆～胸₁₂

算法的时间复杂度是指

A．执行算法程序所需要的时间

B．算法程序的长度

C．算法执行过程中所需要的基本运算次数

D．算法程序中的指令条数

人体每日需要钙的量是（）

A.5g

B.100mg

C.5g

D.10g

E.50g