正确答案: A

物质与氧气发生的反应都是氧化反应

题目：氧气是我们身边常见的物质，以下有关氧气的叙述正确的是

解析：A

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举一反三的答案和解析：

[单选题]29．

watches

解析：29.D【解析】与主语she保持人称、数的一致，注意以- ch结尾的动词变第三人称单数形式时要加-es．

[单选题]4． Lily is___________ taller than her sister．

a little

[单选题]Once a man and his wife worked for a businessman． There was a big box in the business-man-s living room． The businessman pointed at the box and said，"There's only one thing you(11) do．Don't open the box． After saying this，he(12)the living room．The woman said to her husband，"There (13) be something expensive in the box． Let's (14) it，shall we? Her husband said no to her．

mustn’t

解析：11．c【解析】needn't“不必”；wouldn't“不会”； mustn ’t“禁止，不允许”。根据句意C是最佳答案。

[单选题]CIn most situations, light helps us see. But nowadays humans are using too much of it so that it is in fact a kind of pollution.

Because some of the wildlife can be harmed.

[单选题]22． What kind of movies do many young people like?

Action movies

解析：22．B【解析】第四句及第六句可说明这一点。

[单选题]与元素的化学性质关系最密切的是（     ）

元素的相对原子质量 元素的核电核数 原子的核外电子数 原子的最外层电子数