下列叙述，属于铁的化学性质的是（） A．铁具有银白色光泽_爱下问搜题

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问题选择题

下列叙述，属于铁的化学性质的是（　　）

A．铁具有银白色光泽

B．铁能导电

C．铁在潮湿空气接触，变成铁锈

D．铁在点燃的条件下会跟氧气反应，能生成四氧化三铁

答案

A、纯净的铁是光亮的银白色金属不需要通过化学变化表现出来，属于铁的物理性质．故A错；

B、铁能导电不需要通过化学变化表现出来，属于物理性质，故B错；

C、铁在潮湿的空气中生锈生成主要成分是氧化铁的物质，属于化学变化，故C错；

D、铁燃烧生成四氧化三铁，属于化学变化，所以铁在点燃的条件下会跟氧气反应，能生成四氧化三铁，属于化学性质，故D正确．

故选D．

完形填空

Once a man came to a wise man’s house and said, “ I have many bad habits. Which one of them should I   36  first?” The wise man said, “Never tell lies   37  always speak the truth.” The man   38  to do so and went home.
At night the man was about to go out to steal. Before setting out, he   39  for a moment about the promise he made to the wise man. “If he asks me where I have been, what shall I say? Shall I say I went out   40 ? No, I cannot say that. But nor can I   41 . If I tell the truth, everyone will start   42  me and call me a thief. I would be   43  for stealing.” So the man   44  not to steal that night, and gave up this   45  habit.
Next day, he   46  to drink wine. When he was about to do so, he said to himself. “What shall I say to the wise man   47  he asks me what I did during the day? I cannot tell a lie.” And so he gave up the   48  of drinking wine.
In this   49 , whenever the man thought of doing something bad, he   50  his promise to tell the truth at all times.   51 , he gave up all his bad habits and became a very   52  person.
Telling the truth is a very good   53 . If you always speak the truth, you can save yourself from a lot of   54  and become a person whom everyone   55  and favors.
Make a promise: I shall always speak the truth.

B．Face to face

单项选择题

武装叛乱、暴乱罪的主体是( )。

A．所有参加人员

B．罪大恶极者

C．首要分子

D．首要分子或罪行重大者