问题 完形填空
完型填空

     Robert performs his 24-foot boat past willow(柳树) young trees that stick out of the waters of the
Mississippi River. __1__ dances off maples(枫树), their branches heavy with __2__ spring leaves. But a
 _3__ inspection discloses trouble behind the beautiful sight. Rubbish is __4__ in a logjam(浮木阻塞) and hangs from the tree's branches.
     For the next three hours Robert and his team pull plastic bags, tanks, bottles and __5__ bowling pins
out of the water. Then they __6__ for a picnic table caught in the trees. Welcome to the Mississippi River
Beautification Project begun in 1997 with Robert's one man __7__  to pick up rubbish __8__ a 400 mile
stretch(伸展) of the 2,340 mile river. That year, often working __9__, the 22-year-old fellow cleaned 150 miles of shoreline.
     At first the project appeared__10__ and useless. But Robert tried his best to find __11  , and with their backing, he soon had a new boat and five-man __12  -the Boom Crane Crew. Last year alone the crew
 __13_ from the water 44,055 gallon durms,1,104 tires and enough plastic bags to __14__  a football
field. Much of the waste will be __15__.
      "Robert's operation is the only one actually in __16___on the river," says Mark of the Mississippi
River Basin Alliance, a union of environmental groups. "It's the __17_I have ever seen in 20 years, and he
is inspiring others to do the __18_ ."
      "The river has given me a livelihood and brought me so much _19_ ," Robert says, "I want to do
something in __20_ ."

( )1. A. Sunlight  
( )2. A. ripe  
( )3. A. wider  
( )4. A. placed  
( )5. A. ever  
( )6. A. come  
( )7. A. work  
( )8. A. on    
( )9. A. alone  
( )10. A. large  
( )11. A. supporters
( )12. A. family  
( )13. A. came  
( )14. A. clean  
( )15. A. burned  
( )16. A. ending  
( )17. A. biggest  
( )18. A. deed  
( )19. A. time  
( )20. A. return  
B. Air  
B. brown  
B. quicker  
B. piled  
B. even  
B. save  
B. discovery  
B. in  
B. strongly  
B. happy  
B. workers  
B. team  
B. pulled  
B. cover  
B. buried  
B. progress  
B. earliest  
B. favor  
B. joy  
B. turn  
C. Water  
C. falling  
C. closer  
C. trapped  
C. nearly    
C. head    
C. place  
C. off     
C. quietly  
C. impossible  
C. engineers  
C. grade     
C. pushed    
C. build  
C. used    
C. discussion  
C. latest  
C. same    
C. pride  
C. pay  
D. Moonlight  
D. fresh      
D. stricter    
D. thrown      
D. merely      
D. fight      
D. effort      
D. along      
D. fiercely    
D. possible    
D. pioneers    
D. class      
D. appeared    
D. spread      
D. recycled    
D. common      
D. luckiest    
D. good        
D. waste      
D. trouble
答案

1-5 ADCCB   6-10 CDDAC   11-15 ABBBD   16-20 BACBA

实验题

某研究性学习小组对过量炭粉与氧化铁反应的气体产物成分进行研究。

(1)提出假设①该反应的气体产物是CO2

②该反应的气体产物是CO。

③该反应的气体产物是________

设计方案如图所示,将一定量的氧化铁在隔绝空气的条件下与过量炭粉完全反应,测定参加反应的碳元素与氧元素的质量比。

(2)查阅资料

氮气不与碳、氧化铁发生反应。实验室可以用氯化铵饱和溶液和亚硝酸钠(NaNO2)饱和溶液混合加热反应制得氮气。请写出该反应的离子方程式:________________________。

(3)实验步骤

①按上图连接装置,并检查装置的气密性,称取3. 20 g氧化铁、2.00 g碳粉混合均匀,放入48. 48 g的硬质玻璃管中;

②加热前,先通一段时间纯净干燥的氮气;

③停止通入N2后,夹紧弹簧夹,加热一段时间,澄清石灰水(足量)变浑浊;

④待反应结束,再缓缓通入一段时间的氮气。冷却至室温,称得硬质玻璃管和固体总质量为52.24 g;

⑤过滤出石灰水中的沉淀,洗涤、烘干后称得质量为2.00 g。

步骤②、④中都分别通入N2,其作用分别为_____________________

(4)数据处理

试根据实验数据分析,写出该实验中氧化铁与碳发生反应的化学方程式:____________________。

(5)实验优化

学习学习小组有同学认为应对实验装置进一步完善。

①甲同学认为:应将澄清石灰水换成Ba(OH)2溶液,其理由是__________________

②从环境保护的角度,请你再提出一个优化方案将此实验装置进一步完善__________。

单项选择题