SO₂通入I₂的水溶液中生成硫酸和氢碘酸（HI）：SO₂+I₂+2H₂O═H₂SO₄+2HI，可用此原理来测定空气中的SO₂含量．上述反应中，所含元素化合价降低的物质是（　　）

阅读理解,阅读下面材料，根据材料内容和要求，从题后选项中选择一个最佳答案。

                Moving On

The end of school is here at last

It has come so very fast

We look ahead with such delight

The future looks so very bright

It's now time to say goodbye

We're all leaving junior high

Other people, other places

Different schools, different faces

Please don't feel bad and grieve

On the day you take your leave

But celebrate and raise your glass

And say goodbye to all your class

Other subjects, a new class

Different teachers and exams to pass

For everyone in this hall

A new life awaits you all

So don't look sad and cry

You're moving on senior high

Tips: senior high高中

prom night 毕业晚会

positive 积极的；主动的

阅读以上诗歌，根据其内容回答下列各个小题。

读《巩乃斯的马》回答问题

作者为什么“久久地站在那里，发愣、发痴、发呆”？

下列句子中，没有语病的一项是（   ）