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President Hu Jintao flew to the earthquake-hit region in Yushu, Qinghai   on April 18, 2010. At a field hospital on the grounds of a sports stadium, Hu   sat on the bed of Drolma, a middle school student, and held her in his arm as   she wept(哭泣). "Rest assured(放心的), you will have a full recovery(康复). Be   strong. You will have a bright future," he told her.

The 2010 World Expo, Shanghai China
The 2010   World Expo Shanghai China
Duration(举办时间): May 1 to October 31, 2010
Expected visitors: 70 million
Theme(主题) : "Better City, Better Life."
The theme represents the common wish of the people all   over the world for a better living in future urban(城市的) environments.

The 19th FIFA World Cup(世界杯足球赛)
Duration: June 11 to July 12, 2010
Host(主办) nation: South Africa
Number of teams: Thirty-two
Number of matches: Sixty-four
It is the first time that the tournament(锦标赛) has been hosted by a nation in   the Confederation(联盟) of African Football.

President Hu Jintao flew to Yushu, Qinghai _________, 2010.

A. on May 1 B. on June 11 C. on April 18 D. on July 12

President Hu Jintao comforted(安慰) _________ at a field hospital.

A. a middle school student B. a soldier
C. a farmer of Yushu D. a doctor

The 2010 World Expo in Shanghai will end on _________.

A. September 30 B. October 31 C. November 30 D. December 31

The theme of Expo 2010 is "_________"

A. Better City, Bright future. B. Better City, Good Environment.
C. Better City, Better Life. D. Better City, Best Investment(投资).

There will be _________ teams taking part in the 19th FIFA World Cup.

A. 10 B. 12 C. 13 D. 32
科目 化学   题型 选择题   难度 较难
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下列变化属于化学变化的是()

A. 冰块融化 B. 蜡烛燃烧 C. 玻璃粉碎 D. 蔬菜榨汁

为了探究某稀盐酸中溶质的质量分数,甲、乙两同学分别取溶质质量分数相等的稀盐酸 100 g ,甲同学向其中加入氧化铜 8 g ,反应结束后观察到固体全部消失;乙同学向其中加入氧化铜 16 g ,反应结束后观察到固体有剩余。下列有关实验的推断正确的是(

A. 反应后乙同学所得溶液中一定不含盐酸
B. 反应后向甲同学所得的溶液中滴加少量氢氧化钠溶液,一定会有蓝色沉淀生成
C. 反应后甲、乙两同学所得的溶液中溶质的质量分数一定相等
D. 原稀盐酸中溶质的质量分数一定大于7.3%小于14.6%

除去下列物质中所含的少量杂质,所选试剂正确的是()

选项
物 质
所含杂质
除杂质试剂
A
碳酸钠
氯化钾
适量的水
B
氧化钙
碳酸钙
稀盐酸
C
硫酸亚铁溶液
硫酸铜溶液
过量的铁粉
D
氯化钾溶液
稀盐酸
过量的碳酸钠溶液

下列图像能正确反映其对应关系的是()

A. 向一定量 p H = 3 的硫酸溶液中不断加水稀释
B. 向一定量的饱和石灰水中不断加入生石灰
C. 向盛有相同质量的镁和氧化镁的烧杯中分别加入相同溶质质量分数的稀盐酸至过量
D. 将一定量的木炭放在盛有氧气的密闭容器中加热至燃烧

把金属 X 放入 C u ( N O 3 ) 2 溶液中,X表面有红色固体析出;若放入 M g ( N O 3 ) 2 溶液中,
无明显现象。则 X C u M g 三种金属活动性由强到弱的顺序正确的是()

A. M g X C u B. X M g C u
C. M g C u X D. C u X M g

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