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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. |
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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 |
下列图象能正确反映其对应关系的是
A.某温度下,向一定量接近饱和的硝酸钾溶液中不断加入过量的硝酸钾晶体 |
B.向稀盐酸和硫酸钠的混合溶液中加入过量的氢氧化钡溶液 |
C.向氢氧化钠溶液中滴加过量的稀盐酸 |
D.等质量的镁和锌同时分别放入两份溶质质量分数相同的足量稀盐酸中 |
某金属加工厂生产过程中的废液含有少量的硝酸银和硝酸铜,为回收利用资源和防止污染,该厂向废液中加入一定量的铁粉,反应停止后过滤,向滤液中加入少量的稀盐酸,无沉淀产生,则下列有关说法正确的是
A.滤出的固体中一定含有银,也能含有铜 |
B.滤出的固体中一定含有银和铜,一定不含铁 |
C.滤液中一定含有硝酸亚铁,一定没有硝酸根 |
D.滤液中一定含有硝酸亚铁和硝酸铜,可能含有硝酸银 |
下图是甲、乙、丙三种固体物质的溶解度曲线,下列说法错误的是
A.t2℃时,甲、乙两种物质的溶解度相等 |
B.甲的溶解度随温度的升高而增大 |
C.分别将t3℃时甲、乙、丙的饱和溶液降温至t1℃,则所得的三种溶液中溶质的质量分数大小关系是乙>甲>丙 |
D.t1℃时,丙的饱和溶液中溶质的质量分数为40% |
除去下列物质中的少量杂质.所选用的试剂和操作方法都正确的是
选项 |
物质 |
杂质 |
试剂 |
操作方法 |
A |
MnO2 |
KCl |
适量水 |
溶解、过滤、蒸发、结晶 |
B |
CO2 |
H2 |
足量氧气 |
点燃 |
C |
NaOH溶液 |
Ca(OH)2 |
适量Na2CO3溶液 |
过滤 |
D |
稀盐酸 |
硝酸 |
适量硝酸银溶液 |
过滤 |
逻辑推理是化学学习中常用的思维方法.下列推理正确的是
A.中和反应生成盐和水,则生成盐和水的反应一定是中和反应 |
B.化合物是由不同元素组成的纯净物,所以由不同种元素组成的纯净物一定是化合物 |
C.单质中只含有一种元素,所以只含有一种元素的物质一定是单质 |
D.活泼金属能与稀硫酸反应放出气体,则能与稀硫酸反应放出气体的物质一定是活泼金属 |