三元磷化指：（）。A、锌 B、镍 C、锰 D、铁

It was Mr Green _______ looked after my grandmother when I was on business.

A．whom

B．which

C．whose

D．who

China’s telecommunications supervisor has given long-awaited third-generation, or 3G mobile

phone licenses(执照) to three mobile operators. The Ministry of Industry and Information Technology said China's biggest mobile operator, China Mobile, was given a license for TD-SCDMA, the domestically-developed 3G standard. k#

Wang Jianzhou, President of China Mobile said the company had already started construction of new networks to cover all cities by 2011. “After our testing operation of the network which started from last April, we have seen that the new technology has developed into maturity (成熟). By this June, we will finish the second stage of the network construction which covers 28 cities around the country. ”

The other two main carriers, China Telecom and China Unicorn, received respectively licenses for the 3G standards of US-developed CDMA2000 and Europe’s WCDMA. All the three operators expressed an active attitude on the future competition and cooperation in the field of 3G mobile.

The 3G high-speed networks can handle faster data downloads, allowing handset users to make video calls and watch TV programs.

Officials expect that there could be about 280 billion yuan, or about 40 billion dollars of direct investment in new networks over the next two years, an effective measure to boost(提高) the domestic demand and perfect telecom market competition.

1. The 3G standard developed in China is ______. 

A. SLEDMA       B. CDMA2000     C. TD-SCDMA       D. WCDMA

2. How soon will the new networks cover most parts of China?

A. In half a year.    B. In one year.      C. In two years.       D. In three years.

3. According to the president of China Mobile, ______.           

A. 3G mobile phone has developed into maturity

B. the network construction has been finished

C. the network has covered 28 cities in China

D. the second stage of the network hasn't started

4. Which of the following statements is true?

A. More and more companies will receive licenses for the 3G standards.

B. With 3G high-speed networks, users can watch different programs at the same time.

C. Not all of the three operators think well of the future competition of 3G mobile.

D. The operators will spend a great amount of money first before earning more money.

1L0.1mol·L^－1的K₂SO₄溶液中

A．K^＋的物质的量为0.1 mol

B．SO₄^2－的物质的量为0.2mol

C．K^＋的物质的量浓度为0. 1mol·L^－1

D．SO₄^2－的物质的量浓度为0. 1mol·L^－1

抓铲挖土机适于开挖（）

A.山丘开挖

B.场地平整土方

C.水下土方

D.大型基础土方