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。

如图，双曲线y= (k≠0)上有一点A，过点A作AB⊥x轴于点B，△AOB的面积为2，则该双曲线的表达式为____.

防止水土流失属于生物多样性的潜在价值，那么开发新药属于____，提供食物又属于____．

句型转换。

下列不利于聚落形成与发展的因素是（　　）