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阅读理解 Where there is a river, there is a city.  Perhaps this is not always true, but it is true that many of the world's greatest cities have been built on the banks of a river. The Neva River flows through the center of St Petersburg in Russia. Three hundred years ago, the Russian Czar Peter the Great came here and built a new capital-St Petersburg.  Peter the Great, like his country, was strong and proud.  Many great palaces were built during his lifetime. The palaces were large and beautiful,  and they often looked like something out of a fairy tale, St Petersburg has also been the center of many important events in history. In 1941, the Germans tried to destroy the city.  It was under attack for 900 days, but the people of the city never gave in. The Germans burned many of the palaces as they left.  St Petersburg was almost in ruins: fires burned everywhere. Buildings were destroyed, and paintings and stadium lay in pieces on the ground. Rebuilding the city and its cultural relics seemed impossible, but the people of the great city would not give up, 'We will not let our history and city be destroyed, and we will do everything we can to save our city ! ' When the Nazi had gone, the people of St Petersburg began rebuilding the city. Pieces of the palaces that had been hidden before the Nazis came could now be used to rebuild the city and its culture.  It was not easy.  Painters and workers had to be very careful when they were trying to bring the city back to life. It was difficult to save the palaces and building without detracting their old beauty. With the help of old paintings and photographs, the people of St Petersburg were able to bring back the beauty of their culture and history.  Now, after years of hard work, parts of statues have been put back together and missing pieces have been replaced. Old paintings, including a portrait of Peter the Great which was found in the snow outside St Petersburg, have been carefully copied, and the old palaces have been made as wonderful as in the past. Today Peter the Great on his bronze horse can once again look out over the city he built.  Like their hero Peter, the people of St Petersburg have shown that dreams can come true. Strong, proud and united, the people of St Petersburg are modern heroes of Russia. 1. The underlined word 'portrait' in the third paragraph is perhaps closest to____in meaning. A. room B. picture C. knife D. dress 2. Which of the following sentences is not true of St Peterburg according to the passage? A. It was the capital of Russia,  and it was built about three hundred years ago. B. It people never gave in to the Germans during World War Ⅱ. C. The Germans tried to destroy the city because they hated Peter the Great. D. It took years of hard work of the painters and workers to rebuild it. 3. The third paragraph of the passage is mainly about____. A. how bravely the people of the city fought against the Germans. B. how beautiful the city looked now. C. how hard the people of the city worked to rebuild the city. D. how proud the people of the city were. 4. The best title of the passage should be___ A. A City of Heroes B. St Petersburg C. Peter the Great D. Rivers and Cities
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【多选题】烃 C 6 H 12 能使溴溶液褪色,能溶于浓硫酸,用酸性 KMnO 4 氧化得两种羧酸,则该烃是:
A.
CH 3 CH 2 CH = CHCH 2 CH 3
B.
(CH 3 ) 2 C=CHCH 2 CH 3
C.
CH 3 CH 2 CH 2 CH = CHCH 3
D.
(CH 3 ) 2 CHCH=CHCH 3
【单选题】关于线性规划模型的可行域,下面 叙述正确的是
A.
可行域内必有无穷多个点
B.
可行域必有界
C.
可行域内必然包括原点
D.
可行域内必有最优解
【单选题】关于线性规划模型的可行域,下面 的叙述正确的是
A.
可行域内必有无穷多个点
B.
可行域必有界
C.
可行域内必然包括原点
D.
可行域必是凸的
【单选题】关于线性规划模型的可行域,下面( )的叙述正确。
A.
可行域内必有无穷多个点
B.
可行域内必然包括原点
C.
可行域必有界
D.
可行域必是凸的
【单选题】关于线性规划模型的可行域,下面 的叙述正确。
A.
可行域内具有有限多个点
B.
可行域必有界
C.
可行域内必然包括原点
D.
可行域必是凸的
【单选题】关于线性规划模型的可行域,下面叙述正确是
A.
可行域内必有无穷多个点
B.
可行域必有界
C.
可行域内必然包括原点
D.
可行域必是凸的
【单选题】关于线性规划模型的可行域,下面 ( ) 的叙述正确
A.
可行域内必有无穷多个点
B.
可行域必有界
C.
可行域内必然包括原点
D.
可行域必是凸 集
【单选题】(2010?泰安二模)已知常温下:K SP (AgCl)=1.8×10 -10 mol 2 ?L -2 ,K SP (Ag 2 CrO 4 )=1.9×10 -12 mol 3 ?L -3 .则下列叙述正确的是(  )
A.
AgCl在饱和NaCl溶液中的K SP 比在纯水中的K SP 小
B.
向AgCl的悬浊液中加入NaBr溶液,白色沉淀转化为淡黄色,说明K SP (AgCl)<K SP (AgBr)
C.
将0.001mol?L -1 AgNO 3 溶液滴入0.001mol?L -1 KCl和0.001mol?L -1 K 2 CrO 4 混合溶液中,先产生Ag 2 CrO 4 沉淀
D.
向AgCl的悬浊液中滴加浓氨水,沉淀溶解,说明AgCl的溶解平衡向右移动
【单选题】已知常温下:Ksp(AgCl)=1.8 ×10 -10 mol 2 ·L -2 , Ksp(Ag 2 CrO 4 )=1.9 ×10 -12 mol 3 ·L -3 ,下列叙述正确的是 [     ]
A.
AgCl在饱和NaCl溶液中的Ksp比在纯水中的Ksp小
B.
向AgCl的悬浊液中加入NaBr溶液,白色沉淀转化为浅黄色,说明Ksp(AgCl)< Ksp(AgBr)
C.
将0.001 mol·L -1 的AgNO 3 溶液滴入0.001 mol·L -1 的KCl和0.001 mol·L -1 的K 2 CrO 4 溶液中先产生Ag 2 CrO 4 沉淀
D.
向AgCl的悬浊液中滴加浓氨水,沉淀溶解,说明AgCl的溶解平衡向右移动
【单选题】关于线性规划模型的可行域,下面()的叙述正确。
A.
可行域内必有无穷多个点
B.
可行域必有界
C.
可行域内必然包括原点
D.
可行域必是凸的
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