回转机构通常是由（）和（）两大部分组成。

试述学习与教学过程中的基本因素。

About a year ago，if you had asked who Dinara Safina was，the answer would have been，“She is Marat Safin’s younger sister.” She was overshadowed by her wonder brother.But now she has made a name for herself：the world No.1 player in women’s tennis.

The 22­year­old Russian overtook Serena Williams of the US for top ranking on April 20.“Before，every place I go，I am Marat’s sister.Nothing else，”she told New York Times.“I always wanted to be myself，and now finally the results come，and people can know me as Dinara Safina.”

Safina has made it to two great event finals，in the 2008 French and in the 2009 Australian Open，and won a silver medal in the Beijing Olympic Games.

Clearly，family isn’t the only connection Safina and her brother share.Their DNA burns with competitive fire.Safin has held the distinction for years of being a hottempered player on court.When he lost his temper，he would smash a racket (球拍)．Safina is as emotionally explosive as her brother.A headline in the newspaper The Australian once described her as “mad as a snake”．The Sydney Morning Herald，during the Australian Open，summed up Safina’s volatile (不稳定的) emotional state with the headline—Safina goes from basket case to top of the world.

It’s not rare for a family to have two top tennis players.Safina’s father owns a tennis academy and her mother worked as a coach.“I had no choice but to become a tennis player，but I don’t mind being a tennis player，” Safina said.

From this talented family she is also given one of her best weapons on court，her size.She is 1.82 meters tall and weighs 70kg.But it is hard work that led her to her recent success.

“I hope to prove to everyone over the coming months that I deserve the honor of being world No.1，”she said.

小题1:What is the passage mainly about?

A．How Safina came first in women’s tennis.

B．How the parents taught Safina to play tennis.

C．How her brother helped Safina play tennis.

D．How Safina beat her brother in playing tennis.小题2:Which one of the following doesn’t contribute to Safina’s success?

A．Her hard work and strong competitiveness.

B．Her emotional explosion and volatile emotional state.

C．The fact that she is 1.82 meters tall and weighs 70kg.

D．The fact that her parents are both good tennis players.小题3:Which of the following statements is TRUE?

A．Serena Williams was topped by Safina on ranking list on April 20.

B．Dinara Safina was always very confident and eager to succeed.

C．Safina was eager to become a tennis player when she was a child.

D．Marat Safin won the two finals，in the 2008 French and in the 2009 Australian Open.小题4:What can we infer from the headline “Safina goes from basket case to top of the world”？

A．Safina wanted to top the world in tennis when she was a baby in a basket.

B．After she won the Australian Open，Dinara Safina cried.

C．Too nervous at first，Safina finally gained confidence and won.

D．Safina learnt from the basket case and finally came top of the world.

美国总统的决定是通过哪些途径做出的？

网络测试可分为（）、（）及（）。

按负担室内负荷所用的介质分类，空调系统可分为( )。

A．空气—水系统

B．全空气系统

C．全水系统

D．集中式系统

E．冷剂系统