题目内容
18.____ can prevent the earth from being hurt by harmful rays from the sun.( )| A. | CO | B. | CO2 | C. | H2O | D. | O3 |
分析 臭氧可以防止地球受到来自太阳有害射线的伤害.
解答 正确答案:D.A是一氧化碳,B是二氧化碳,C是水,D是臭氧,根据化学常识可知臭氧层是地球大气的防护层,可以防止地球受到来自太阳有害射线的伤害,故选择D.
点评 本题考查化学常识,了解一定的化学知识是解此题的关键.
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