各种酸碱盐水溶液能够导电，是因为其内部存在大量可以自由移动（）。A.正离子 B.负离

阅读选择最佳选项。

    China's Zhou Yang won the Olympic Games women's l 500-metre short-track gold on Saturday. 

    "I told myself a few days ago' Zhou Yang, you can do this',"the 18-year-old olympic newcomer said.

"I believed in myself."

    "This gold medal will change things. It will give me more confidence. It will give my mum a better

lifestyle."    

     China's Shen Xue, aged 31, and Zhao Hongbo, aged 36, celebrated St. Valentine's Day and the Chinese

New Year by winning a gold medal in the pairs figure skating at the Vancouver Olympics on Sunday. "We

have not competed(比赛)much in the last two years and we came back to compete at the Olympic Games

as it is our dream to win an Olympic gold medal."

    China's Wang Meng won again her Olympic women's 500-meter short-track skating title on Wednesday. 

   "I have a lot of confidence.I feel that it's my duty to win that. It's still the Chi- nese New Year holiday," she

 said,"Kowtow(磕头)was the only way to express my thanks to the coaches, team leaders and teammates."

1. How old is the Olympic newcomer, Zhou Yang?

A.18

B.25

C.33

D.36

2. What is Shen Xue and Zhao Hongbo's dream?

A. To celebrate Chinese New Year.

B. To give their parents a better life.

C. To win an Olympic gold medal.

D. To spend a special Valentine's Day.

3. In what sport did Wang Meng win the gold medal?

A. Figure skating.

B. Women's 1500-metre short-track skating.

C. Skiing.

D. Women's 500-metre short-track skating.

4. Where may you probably read this passage?

A. In a story book.

B. In a news report.

C. In a TV play.

D. In an advertisement.

晶界处的晶格不规则，原子排列不整齐，并常有其他杂质原子聚集，故晶界处的强度（），塑性（）。

A、较高、较低

B、较低、较高

C、较高、较高

下面四句诗中，反映了我国古代民风民俗的一句是（）

A.箫鼓追随村社近

B.闲来垂钓碧溪上

C.沙场秋点兵

D.零丁洋里叹零丁

消除速率

在视觉信号中，黄色表示的含义是（）。

A.停车

B.注意或减低速度

C.规定速度运行

D.无意义