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阅读理解。 The capital of Switzerland, Bern, is a beautiful city. It was founded in 1191 and has a lot of attractions and historic sites as well as an active cultural life. It is here that Albert Einstein once worked. The city of Bern was built with local sandstone in Gothic style (哥特式) with more arcades (拱廊) than any other city in Europe. It is one of the most attractive old towns in Europe,and is famous for its great sandstone buildings,historical towers and eleven famous fountains. Over the centuries,the city has been protected very well,and in 1 983 the UNESC0 (联合国科教文组织) claimed Bern a World Heritage Site. One house after the other and shop after shop,rows of shops are connected by ong sandstone arcades. Rain or shine, it is a pleasure to walk along one of the longest shopping streets. Bern has Switzerland's tallest Gothic cathedral (大教堂). The Münster-Terrasse,a square in front of the cathedral,has been a famous meeting place for centuries. The wonderful Clock Tower has puppets (木偶) that come out before the hour and perform a 1ittle short play. The Center Paul Klee shows the largest collection in the world of one of the world's greatest 20th century artists. The Swiss Alpine Museum displays a history of the Swiss Alps (阿尔卑斯山). Bern's shining green river,Aare,winds its way alongside the old town and is lined with a number of scenic spots. Only a few minutes' walk from the station will take you to its tree-lined banks surrounded by nature. The Aare attracts people of all ages,especially in summer when the clean water invites you to iump into the river. It is during this time that mahy of the people in Bern enjoy swimming. 1. According to the passage,which of the following does Bern NOT have? A. A long history. B. Tower Bridge. C. Puppet performances. D. Historic sites. 2. You may find the passage on a ______. A. city magazine B. travel poster C. school newsletter D. company notice board 3. The UNESCO claimed Bern as a World Heritage Site because _______. A. it has the tallest Gothic cathedral of Switzerland B. the attractions are well protected C. people living there have an active country life D. it is the place that'Albert Einstein onee worked in 4. Which of the following statements is NOT TRUE? A. Bern is a capital city with a lot of places of interest in the world. B. The river Aare is a beautiful place attracting people of different ages. C. Paul Klee is one of the most famous artists in the World. D. Many of the people in Bern enjoy swimming in summer.
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举一反三
【多选题】存在于血浆中的缓冲对是
A.
NaHCO3/H2CO3
B.
Na2HPO4/NaH2PO4
C.
KHCO3/H2CO3
D.
K2HPO4/KH2PO4
E.
Na-蛋白质/H-蛋白质
【单选题】已知H3PO4的pKa1 = 2.12,pKa2 = 7.20,pKa3 = 12.36,则在 pH = 5.0时,溶液中H3PO4的主要存在形式为( )(选填(1)H2PO4- ;(2)HPO42- ;(3)PO43- ;(4)H3PO4。)
A.
(1)
B.
(2)
C.
(3)
D.
(4)
【单选题】在Na 2 HPO 4 溶液中,存在着下列平衡:HPO 4 2- ?H + +PO 4 3- ,HPO 4 2- +H 2 O?H 2 PO 4 - +OH - ,并且溶液呈碱性.欲使溶液中的HPO 4 2- 、H + 、PO 4 3- 浓度都减小,可采取的方法是(  )
A.
加盐酸
B.
加石灰水
C.
加烧碱
D.
用水稀释
【单选题】枇杷叶的正品原植物为( )
A.
蔷薇科
B.
豆科
C.
十字花科
D.
木兰科
【单选题】在 H 2 PO 4 - -HPO 4 2 - 缓冲溶液中,抗酸成分是( )
A.
[ H + ]
B.
[OH - ]
C.
H 2 PO 4 -
D.
HPO 4 2 -
【单选题】在Na 2 HPO 4 溶液中,存在着下列平衡:HPO 4 2 - H + + PO 4 3 - ;HPO 4 2- +H 2 O H 2 PO 4 - +OH - ,已知该溶液呈碱性。欲使溶液中的HPO 4 2 - 、H + 、PO 4 3 - 浓度都减小,可采取的方法是
A.
加石灰水
B.
加盐酸
C.
加烧碱
D.
用水稀释
【单选题】在0.1摩尔/升H3PO4溶液中,各种离子浓度由大到小的顺序是 ________。
A.
PO43->HPO42->H2PO4->H+
B.
PO43->H+>HPO42->H2PO4-
C.
H+>H2PO4->HPO42->PO43-
【单选题】枇杷叶的正品原植物为
A.
蔷薇科
B.
豆科
C.
十字花科
D.
木兰科
E.
蓼科
【简答题】磷酸(H 3 PO 4 )在溶液中能够以H 3 PO 4 、H 2 PO 4 - 、HPO 4 2- 、和PO 4 3- 四种粒子形式存在,当溶液的pH发生变化时,其中任一种粒子的物质的量占四种粒子总物质的量的分数δ也可能发生变化.下图是H 3 PO 4 溶液中,各种粒子的物质的量分数δ随pH的变化曲线: (1)设磷酸总浓度为c(总),写出c(总)与各粒子浓度间的关系式______. (2)向Na...
【单选题】注视电灯光之后,闭上眼睛一般会出现一个灯的光亮形象出现于黑色背景之上,这是( )
A.
正后像
B.
负后像
C.
遇觉像
D.
听觉像
E.
以上都不是
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