．医用热敷袋使用时要轻揉，袋内的反应可看作是铁粉、空气和水相

【名词&注释】

化学反应(chemical reaction)、错别字(wrongly written characters)、青海湖(qinghai lake)、旅游景点(tourist sites)、昆仑山(kunlun mountains)、答题卡(answer sheet)、文质彬彬(suave)、氢氧化铁(ferric hydroxide)、相提并论、矢志不移(consistent devotion)

[单选题]．医用热敷袋使用时要轻揉，袋内的反应可看作是铁粉、空气和水相互作用，产生氢氧化亚铁[Fe(OH)2]，最终转化为氢氧化铁^{(ferric hydroxide)}[Fe(OH)3]。下列说法不正确的是

A. 热敷袋放出的热量是由化学反应产生的
B. 总反应为2Fe+O2+3H2O=2Fe(OH)3
C. 上述含铁物质中铁元素的化合价有0、+2、+3
D. 热敷袋中的铁粉与水在未使用时要分别密封保存

查看答案&解析查看所有试题

学习资料：

[单选题]At the radio station, the pop star ________.

A. showed fans how to become famous
B. gave a performance on the air
C. met fans and signed for them
D. told people how he lived his life

[单选题]第三部分：阅读理解（共20小题：每小题2分，满分40分）阅读下列短文，从每篇短文后所给各题的四个选项（A、B、C和D）中，选出最佳选项，

A. 并在答题卡上将该项涂黑。
B. A
C. It was a Sunday and the heavy storm had lasted all night.The morning after the storm,though,was beautiful:blue skies,warm air and a calm,inviting sea touching the shore gently.
D. My father realised it was a good day for fishing and invited my sister and me to go with him.I was only 14 and fishing had never been my thing, but I decided to go all the same.I’m so glad I did.
E. On the road to the harbour we could see the terrible destruction on the coast,but the harbour itself was in fairly good shape.After allm it was protected by the arms of a bay that had only one tiny channel to the sea.As we got on board,we noticed two big humps(脊背) in the distance.
F. On approaching them,we saw it was a mother whale with her baby.We couldn’t beliece it ----there aren’t any whales along the coast here.The storm must have driven them across the ocean into the bay, in which the still water was so badlly polluted that nothing could surive.
G. The little baby whale ----actually as big as our boal----was obviously stuck and could not move.The mother dived under the water and came up suddenly,making big whirlpools(漩涡) and waves.”She’s trying to help her baby, but on the wrong side,”my father said.At this point,myfather moved our boat in a semicirele to the other side and ,heading the boat towards the baby whale,pushed it gently.With our several gentle pushes the big hump turned over and disappared under water.Then it swam up right beside its mum.They stuggled in their desperate attempts to escape but missed the exit and started heading in the wrong direction.We hurried up to the whales
H. and tried to lead them towards the bay channel.Showly,they let us lead them,some-times rising from the water right beside us to breathe----and to give us a trusting look with those huge eyes.Once they hit their first part of clean water flowing straight from the sea,the mum gave us a wave with her tail and off they swam into the distance.
I. In the excitement it had felt like only a few minutes, but we had been with those wonderful animals for almost an hour and a half.That was the simple and lasting beauty of the day,Nearly four decades later ,I still look back fondly to that golden day at sea.
J. 51. The author says “I’m so glad I did .”(in Para.2)because __________.
K. be witnessed the whole process of fishing
L. he enjoyed the beauty of the calm sea
M. he experienced the rescue of the whales
N. he spent the weekend with his family

[单选题]17．

A. terrible
B. good'
C. interesting
D. successful

[单选题]Ⅲ．阅读理解A

A. The number of travelers to Tibet has grown by 10% every year for a few years． Since July l，2006，when the first train ran 1956 kilometers from Xining to Lhasa，more and more people have been going to Tibet．
B. Passengers can also enjoy many activities during the journey，like Tibetan dancing and Karaoke．
C. Unlike most Chinese trains which have open-hole toilets，this one has special toilets which can collect the waste． There is also a special rubbish system (杀统) in the train that keeps environment clean． ll the windows on the train can protect peo-ple from the bright sunlight． TV and electrical sockets(插座) for computers and mobile phones can be found on the train．
D. It makes passengers feel more comfortable when they have enough oxygen on the famous"roof of the world ．There are also doctors on the train to make sure that all of the travelers are safe．
E. Which of the following is NOT among the places of interest?
F. Qinghai Lake
G. Karaoke．
H. Kunlun Mountain．
I. The Potala Palace．

[单选题]下列词语没有错别字的一项是（ ）（2分）

A. 秀颀 手屈一指 怡然自乐
B. 馨香 争妍斗艳 矢志不移^{(consistent devotion)}
C. 蹒跚 相提并论 一泄千里
D. 斑澜 文质彬彬^(suave) 猝不及防

本文链接：https://www.51ksbd.net/show/0zxvvq.html