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【简答题】
竹炭包（见图1）是一种集观赏与空气净化为一体的产品．这种产品可对及室内空气中的一氧化碳、甲醛等有害气体进行吸附．某课外小组对竹炭进行初步探究． 【提出问题】竹炭中是否含有碳元素． 【猜想与假设】竹炭中含有碳元素 【查阅资料】①新鲜的血液，遇一氧化碳由鲜红变为暗红． ②氢氧化钠能与二氧化碳发生化学反应． 【设计实验】所用装置如图2所示．（A装置的作用为吸收空气中的水和二氧化碳） （1）实验开始后，C装置中产生白色沉淀，反应化学方程式为______，E装置中新鲜的鸡血变为暗红色． （2）小红认为A、B装置间，增加澄清石灰水，目的是______． （3）小明认为可以用如图3所示的装置，替换原装置中的E装置，你认为______（填“可以”或“不可以”），原因是______． 【结论】竹炭中含有碳元素． 【拓展应用】竹炭细密多孔，牙膏中含有竹炭等成分具有消炎、止痛、化淤、去污等功效，下列有关竹炭牙膏的用途描述正确的______． A．可防癌抗衰老 B．虫咬、灼伤可消炎止痛 C．可除去口中异味D．可除衣领袖口等处的汗渍．
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举一反三
【单选题】The story shows that President Coolidge______.
A.
was a man of few words, but with humour
B.
was bad-tempered, but very polite to women
C.
was always quiet, and had no sense of humour
D.
was often silent because he hated people changing his habit
【单选题】Which of the following is TRUE about Charlie Chaplin?
A.
He was honoured with an Oscar after death.
B.
His silent movies are still popular today.
C.
His birth brought poverty to his family.
D.
He was famous for his funny words.
【单选题】You want to know my age? __________? [two friends]
A.
Could I ask why you'd like to know
B.
May I ask the reason why you want to know
C.
Why do you ask
【单选题】The story shows that President Coolidge__________ ．
A.
was always quiet，and had no sense of humor
B.
was bad-tempered，but very polite to women
C.
was a man of few words，but with humor．
D.
was often silent because he hated people changing his private life
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