A river ran down from a mountain through many villages and forests. Then it (arrive) at a desert. "I went through so many  (problem). I should have no trouble crossing the desert, she thought. As she started, she found herself disappearing (slow) into the sand. After many tries, she still failed.

this time, a deep voice said, "If a breeze(微风) can cross the desert, so can a river." It wasvoice of the desert. But the river answered, "That's because a breeze can fly, but I can't."

"That's because you can't give up you are. Let yourself evaporate(蒸发)into the breeze and you can cross the desert easily," said the desert.

"Give up what I am now? No! No!" the river (agree)with this idea." The breeze can carry the vapour  (cross) the desert and let it leave as rain. The rain will form a river again, "said the desert. "And whether you're a river or vapour, your nature(本性) never changes.

After (hear) this, the river didn't feel . (frighten). It went into the open arms of the breeze. It carried her to the next stage of her life.

请你根据学习函数的经验，利用上述表格中所反映出的y与x之间的变化规律，对该函数的图象与性质进行探究.

①片面追求高速度

②自然环境遭到破坏

③当时存在严重的“浮夸风”现象

④农业科技化取得重大成果