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【简答题】
One day last summer, watching the boys and girls trying to catch butterflies I remembered something happened when I was young.When I was a boy of 12 in South Carolina, something happened to me that cured me forever of wanting to put any wild creature in a cage. We lived on the edge of a wood, and every evening at dusk the mockingbirds would come and rest in the trees and sing. No musician can sing more beautiful than the birds. I decided that I would catch a young bird and keep it in a cage and in that way would have my own private musician. I finally succeeded in catching one and put it in a cage. At first, the bird flied about the cage, but eventually it settled down in its new home. I felt very pleased with myself and looked forward to some beautiful singing from my tiny musician. I had left the cage out, and on the second day my new pet’s mother flew to the cage with food in her mouth. The baby bird ate everything she brought to it. I was pleased to see this. Certainly the mother knew better than I how to feed her baby. The following morning when I went to see how my bird was doing, I discovered it on the floor of the cage, dead. I was shocked! What had happened! I had taken good care of my little bird. Arthur Wayne, the famous ornithologist, happened to be visiting my father at the time, hearing me crying over the death of my bird, explained what had occurred. “A mother mockingbird, finding her young in a cage, will sometimes bring it poison berries. She thinks it better for her young to die than to live in cage.” Never since then have I caught any living creature and put it in a cage. All living creatures have a right to live free. 小题1:Why did the writer catch a mockingbird when he was a boy of 12? A.He had just got a new cage. B.He liked its beautiful feather. C.He wanted a pet for a companion. D.He wanted it to sing for him. 小题2:The mockingbird died because it ______. A.drank the poisonous water by mistake B.was frightened to death C.refused to eat anything D.ate the poisonous food its mother gave it 小题3:An ornithologist probably means ______. A.a religious person B.a kind person C.an expert in birds D.a schoolmaster 小题4:What is the most important lesson the writer learned from the incident? A.Freedom is very valuable to all living things. B.All birds put in a cage won’t live long. C.You should keep the birds from their mother. D.Be careful about food you give to baby birds.
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【单选题】下列有关Na 2 CO 3 和NaHCO 3 的性质比较中,错误的是(  )
A.
热稳定性:Na 2 CO 3 >NaHCO 3
B.
溶解度:Na 2 CO 3 <NaHCO 3
C.
与盐酸反应的速率:Na 2 CO 3 <NaHCO 3
D.
相对分子量:Na 2 CO 3 >NaHCO 3
【简答题】Unit 1 Page 10.pdf
【多选题】下列有关Na 2 CO 3 和NaHCO 3 性质的比较中,正确的是(  )
A.
对热稳定性:Na 2 CO 3 >NaHCO 3
B.
常温时水溶性:Na 2 CO 3 <NaHCO 3
C.
与稀盐酸反应的快慢:Na 2 CO 3 >NaHCO 3
D.
水溶液的碱性:Na 2 CO 3 >NaHCO 3
【单选题】下列有关Na 2 CO 3 和NaHCO 3 的叙述中,正确的是
A.
NaHCO 3 俗名纯碱,Na 2 CO 3 俗名苏打
B.
受热时,NaHCO 3 比Na 2 CO 3 容易分解
C.
NaHCO 3 溶液显酸性,Na 2 CO 3 溶液显碱性
D.
NaHCO 3 和Na 2 CO 3 各1mol分别与过量盐酸充分反应,产生CO 2 的质量不同
【单选题】有关Na 2 CO 3 和NaHCO 3 的叙述中正确的是(  )
A.
NaHCO 3 比Na 2 CO 3 热稳定性强
B.
Na 2 CO 3 和NaHCO 3 均可与澄清石灰水反应
C.
Na 2 CO 3 和NaHCO 3 均可与NaOH溶液反应
D.
相同质量的Na 2 CO 3 和NaHCO 3 分别与足量稀盐酸作用时,产生的气体质量相同
【单选题】下列有关Na 2 CO 3 和NaHCO 3 的叙述中,正确的是(  )
A.
受热时,NaHCO 3 比Na 2 CO 3 容易分解
B.
NaHCO 3 俗名大苏打,Na 2 CO 3 俗名纯碱
C.
NaHCO 3 溶液显酸性,Na 2 CO 3 溶液显碱性
D.
NaHCO 3 和Na 2 CO 3 都可以与盐酸反应,而且都产生CO 2
【多选题】退出壁垒障碍主要有以下几点( )。
A.
资产专用性和沉没成本
B.
解雇费用
C.
政策法律的限制
D.
企业制度
【单选题】下列有关Na 2 CO 3 和NaHCO 3 性质比较中,正确的是 [     ]
A.
热稳定性:Na 2 CO 3 <NaHCO 3
B.
与稀盐酸反应快慢:Na 2 CO 3 <NaHCO 3
C.
常温时水溶液中的溶解度:Na 2 CO 3 <NaHCO 3
D.
物质的量相同时,消耗盐酸:Na 2 CO 3 <NaHCO 3
【单选题】以下正确的函数首部是( )。
A.
double fun(int x , int y)
B.
double fun(int x ; int y)
C.
double fun(int x , int y);
D.
double fun(int x,y)
【单选题】下列有关Na 2 CO 3 和NaHCO 3 的性质比较中,错误的是 [     ]
A.
热稳定性:Na 2 CO 3 >NaHCO 3
B.
溶解度:Na 2 CO 3 $amp; NaHCO 3
C.
与盐酸反应的速率:Na 2 CO 3 $amp; NaHCO 3
D.
相对分子量:Na 2 CO 3 >NaHCO 3
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