一定温度下，将0.1molAgCl加入1L 0.1mol·L－1Na2CO3溶液

如图是某品牌矿泉水标签的部分内容，请按要求填写：

XX矿泉水 主要成分：钾离子：1.0-27.0mg/L氯离子：1.0-24.0mg/L 镁离子：0.1-5.0mg/L硫酸根离子：0.4-20.0mg/L 碳酸氢根离子173-205mg/LpH7.8±0.5

（1）硫酸根离子的化学符号是______；

（2）矿物质水的主要成分是H₂O，水中氧元素的化合价是______；该矿泉水显______（填“酸性”或“碱性”或“中性”）：

（3）鱼类可在水中呼吸，是因为水中溶解有______（填化学式）．

完形填空。

The True Story of Treasure Island      It was always thought that Treasure Island was the product of Robert Louis Stevenson's imagination   1  , recent research has found the true story of this exciting work.      Stevenson, a Scotsman, had lived   2   for many years. In 1881 he returned to Scotland for a   3  . With him were his American wife Fanny and his son   4  .      Each morning Stevenson would take them out for a long   5   over the hills. They had been   6   this for several days before the weather suddenly took a turn for the worse. Kept indoors by the heavy rain Lloyd felt the days   7  . To keep the boy happy Robert asked the boy to do some   8  .      One morning, the boy came to Robert with a beautiful map of an island. Robert   9   that the boy had drawn a large cross in the middle of  10   "What's that?" he asked "That's the  11  treasure." said the boy. Robert suddenly  12  something of an adventure story in the boy's  13 . While the rain was pouring Robert sat down by the fire to write a story. He would make the  14  a twelve-year-old boy just like Lloyd. But who would he the pirate (海盗)?      Robert had a good friend named Henley, who walked around with the  15  of a wooden leg. Robert had always wanted to  16  such a man in a story.  17  Long John Silver the pirate with a wooden leg, was  18 .      So, thanks to a  19  September in Scotland a friend with a wooden leg and the imagination of a twelve- year-old boy we have one of the greatest  20  stories in the English language.

( )1. A. However     ( )2. A. alone       ( )3. A. meeting     ( )4. A. Lloyd       ( )5. A. talk       ( )6. A. attempting  ( )7. A. quiet       ( )8. A. cleaning   ( )9. A. doubted     ( )10. A. the sea   ( )11. A. forgotten  ( )12. A. saw       ( )13. A. book       ( )14. A. star       ( )15. A. help       ( )16. A. praise     ( )17. A. Yet       ( )18. A. read       ( )19. A. rainy      ( )20. A. news       B. Therefore  B. next door  B. story     B. Robert     B. rest       B. missing   B. dull       B. writing   B. noticed   B. the house  B. buried     B. drew       B. reply     B. hero       B. problem   B. produce         B. Also       B. born       B. sunny      B. love       C. Besides   C. at home   C. holiday   C. Henley     C. walk       C. planning   C. busy       C. drawing   C. decided   C. Scotland   C. discovered      C. made       C. picture   C. writer     C. use       C. include   C. But       C. hired     C. cool       C. real-life  D. Finally      D. abroad       D. jib          D. John         D. game         D. enjoying     D. cold         D. exercising   D. recognized   D. the island   D. unexpected                       D. learned      D. mind         D. child        D. bottom       D. accept       D. Thus         D. written      D. windy        D. adventure

菠菜等在烹调前进行焯水处理可提高钙的生物利用率是因为除去较多的（）

A、植酸

B、草酸

C、脂肪酸

D、抗坏血酸

某企业向银行借贷一笔资金，按月计息，月利率为1.2%，则年名义利率和年实际利率分别为( )。

A．13.53%和15.39%

B．13.53%和14.40%

C．14.40%和15.39%

D．14.40%和15.62%

按照所搜集资料的特征，调查方法可分为（）。

A.访谈调查方法和观察实验方法

B.询问调查方法和观察实验方法

C.定量调查方法和访谈调查方法

D.定量调查方法和定性调查方法