已知某数的3倍与3的差等于6，设某数为x，可列出方程：______．

阅读理解。

     BEIJING-Apple Inc is one step closer to beginning sales of iPad2 tablet computers with cellular  

network compatibility (兼容) for the first time in the Chinese mainland, where the consumer-electronics

giant is in the midst of an aggressive expansion.

     According to China's Telecommunication Equipment Certification Center, a device by Apple with

third-generation high-speed wireless data capabilities was issued the network access license needed for

the company to begin official sales in China. The device, listed under model number "A1396", is

compatible with the 3G standard WCDMA, and would work with the cellular network operated by

Apple's local iPhone partner, China Unicom (Hong Kong) Ltd.

       China Unicom declined  to comment.

       Apple already offers the 3G iPad2 in Hong Kong through its partners, but currently only offers

Wi-Fi versions of the device in the Chinese mainland. Still, consumers in China, which according to

research firm IDC surpassed  the US as the world's largest PC market in the second quarter, have been

purchasing 3G tablets through unofficial channels.

       Separately, Apple spokeswoman Carolyn Wu said on Sept 6 that the company's first Hong Kong

store, set to open this quarter, will be located in the city's central shopping and business district in the

International Finance Center's upscale (高档的) IFC mall, a commercial center and sightseeing spot

along the city's waterfront. Wu also said that Apple is planning a new store in Shanghai later this quarter,

which will be its biggest store in China. She declined to give more details or to comment on the 3G iPad2.

       Apple currently has four full-service Apple stores in the mainland, which receive the most traffic of

any Apple stores in the world. The company otherwise relies on resellers to get its products into the

market.

       The new stores reflect Apple's confidence in rising demand for its products such as smart phones

and tablet computers. Sales in the Chinese mainland, Hong Kong and Taiwan helped boost (增长) the

company's third-quarter results, newly appointed Chief Executive Tim Cook said in July. China revenue (收益) surged (激增) six-fold to about $3.8 billion during the three months ended June 25.

       "This has been a substantial (重大) opportunity for Apple and I firmly believe that we're just

scratching the surface right now," Cook said at the time, referring to strong sales in China. "I see an

incredible opportunity for Apple there."

       From China Daily 2011-09-08

1. According to the news, which of the following statements is true?     

A. WCDMA is not the only 3G standard in the world.

B. Apple Inc sells its products in the market of the Chinese mainland all by its own stores.

C. The consumers in China can only get iPad2 of Wi-Fi versions.

D. Chinese mainland is the second largest PC market in this year's second quarter.

2. Which one of the following phrases can replace the underlined word in paragraph 1?

A. in the interests of    

B. in the front of    

C. in the process of        

D. in the case of

3. How many full-service Apple stores are there in China?   

A. 4.            

B . 6.            

C. 8.          

D. Unknown.

4. By saying "we're just scratching the surface right now", Cook means ________.    

A. they don't know much about China's market

B. they will sell more products and gain more profit in China

C. they need to obtain more permission from China's government

D. they ignored the rural market in China

中国由协定关税制度变为国定关税制度始于（）年。

A.1912

B.1927

C.1929

D.1931

临床怀疑泌尿系结石首选的检查是（）

A.腹平片

B.肾盂造影

C.CT体层检查

D.上消化道造影检查

E.腹部侧位片

由上海证券交易所自主开发的中国基金信息分类获得XBRL国际组织认证，成为国际XBRL应用领域第一个获得XBRL国际认证的基金信息分类。

高效液相色谱分析所用的检测器按适用性可分为（）检测器和通用型检测器。