高中课本中有多处“科学探究”，下列说法正确的是 A．将Fe(OH_爱下问搜题

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问题选择题

高中课本中有多处“科学探究”，下列说法正确的是

A．将Fe(OH)₃胶体和泥水分别进行过滤，分别得到Fe(OH)₃沉淀和泥土

B．将铝箔在酒精灯上加热至熔化，观察熔化的铝并不滴下，这是因为铝表面的氧化膜保护了铝

C．SO₂与CO₂性质相似，其与Na₂O₂反应的化学方程式为：2SO₂+ 2Na₂O₂=2Na₂SO₃+ O₂

D．食醋浸泡有水垢的暖壶或水壶，清除其中的水垢的离子方程式：2H⁺+CaCO₃=Ca²⁺+H₂O+CO₂↑

答案

答案：B

A：胶体中的胶粒是完全可透过滤纸的，再者Fe(OH)₃胶体中也不可能有Fe(OH)₃沉淀；B：所述正确；C：SO₂与Na₂O₂反应的化学方程式为：SO₂+ Na₂O₂=Na₂SO₄；D：食醋的主要成分醋酸为弱电解质，在方程式中不能拆：2CH₃COOH+CaCO₃=Ca²⁺+2CH₃COO^—+H₂O+CO₂↑，答案为B

完形填空

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
After graduation from a medical school, I began to take a job in a small hospital's emergency department．As the 36 member of the group, I had to work on Christmas Eve．
At 9 pm, the ambulance 37 a man in his 60s who was having a heart attack．My patient was   38 , but I did my best．Eventually he 39  the night．
The following year, still the newest member, I got Christmas Eve 40 again．At 9 pm sharp, I was told there was a 41  in the hall who wanted to speak with me．
When I approached them, the man 42 himself as Levin and said, "you probably don't ' 43 me, but last Christmas Eve you saved my life．Thank you for the year you gave me．"He and his wife hugged me and handed me a small 44 and left, I was more than a little surprised and 45   ．
The followin

g year a new doctor joined the group 46  I volunteered for the shift because I wanted to see if the Levins would 47 ．
I 48  the door．Once again, at   49 9 pm, the Levins appeared．We   50 and Levin said he'd come to see me every Christmas Eve, and that   51  he didn't come, I would know it just wasn't his year．
The last year I saw him, he brought me a crystal bell engraved （雕刻） with a single word: Friendship．Levin   52  the next year．Now, my family, friends and I   53 that bell every Christmas Eve at exactly 9 pm and 54  to the man who didn't forget to bring me good   55 ．

B．brought about

A．gave an eye to

B．kept away from

C．kept an eye on

D．kept hold of

B．passed away

C．congratulate

多项选择题

人工抬运山石时应注意以下几点（）

A、绳扣应结活扣，并须受力后牢实，拆下时易解

B、安石要照顾向背，有利于下一层石头的安放

C、过重的抬杆周围应有专人引路，上下坡道时应有人在杆端辅助推拉

D、走石用撬棍利用杠杆原理翻转和移动山石