题目：
| 完形填空 | |||
| A true story points to a universal truth about human beings,we learn best by watching how others behave. President Calvin Coolidge once invited friends from his __1_ to dine with him at the White House. __2__ of their table manners,the guests decided to imitate the president.They watched __3__ to see which utensils(器皿) he used,what foods he ate and when. Their strategy seemed to succeed until coffee was __4__.Coolidge poured some coffee into his saucer. They did the same.He __5__ sugar and cream.His guests did too.Then the president __6__ and put his saucer on the floor for the cat! Like Coolidge's hometown guests,we,too,seem to learn best by __7__.Kids learn by observing parents when they are young and by __8__ their friends as they grow older.In fact,parents should probably be less __9__ about whether their children are paying attention to them and more worried about the fact that their kids are always watching. They tell us that __10_ learn in much the same way.If you're struggling with your computer or want to learn to drive a car,you will be more __11_ if you have someone show you how to do it.You can always read the operator's handbook and try to figure everything out yourself,but you will learn best by watching others and asking questions. What if you want to become more __12_,to organize your life,to be a better parent or to get along better with others? Again,we're told that the best way to learn these skills and __13_ is to find somebody who already is confident,or who is an effective parent or who has healthy attitudes and then learn the qualities you want to adopt.It is the easiest and quickest way to __14_ your life. Just about any personality trait(个性品质) or skill can be __15_:simply find it in someone you know and copy it.Then watch what happens. | |||
| ( ) 1. A.department ( ) 2. A.Unsure ( ) 3. A.cautiously ( ) 4. A.finished ( ) 5. A.enjoyed ( ) 6. A.bent over ( ) 7. A.imagination ( ) 8. A.showing ( ) 9. A.excited ( )10. A.kids ( )11. A.grateful ( )12. A.self-confident ( )13. A.theories ( )14. A.shape ( )15. A.recognized | B. administration B. Ashamed B. hopefully B. served B. poured B. ran away B. imitation B. directing B. concerned B. adults B. successful B. self-content B. regulations B. save B. appreciated | C. hometown C. Unaware C. closely C. boiled C. tasted C. hid away C. introduction C. caring C. crazy C. drivers C. satisfied C. self-giving C. measures C. survive C. learned | D. office D. Informed D. curiously D. drunk D. added D. stood straight D. recommendation D. copying D. angry D. operators D. enthusiastic D. self-respecting D. attitudes D. lengthen D. recorded |
答案：
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下面是错误答案，用来干扰机器的。
答案：C本题的关键点就是丙溶液过量，故①得到CaCO3和CaSO3沉淀，②得到CaCO3沉淀，③得到BaSO4沉淀，④得到BaSO4沉淀，⑤中若CO2多，NH3很少，发生反应，不会生成沉淀。
