患者男性，42岁。因肾衰竭住院，需进行肾移植。该患者移植3周后发现腰胀痛、排尿量减少

5x²+1=0是一元二次方程。[ ]

植物的向性运动与生长素的调节有关。根据所学知识，回答有关问题：

(1)图中胚芽鞘直立生长的是__________，向光源弯曲生长的是_____________，不生长的是________。

(2)若要探究植物向光性产生的外因，应设置上图______对照实验。若要探究植物向光性产生的内因，应设置上图_________对照实验。若要探究胚芽鞘感受光刺激的部位，应设置上图________对照实验。

When Paul was a boy growing up in Utah, he happened to live near a copper smelter(炼铜厂), and the chemicals that poured out had made a wasteland out of what used to be a beautiful forest. One day a young visitor looked at this wasteland and called it an awful area. Paul knocked him down. From then on, something happened inside him.

Years later Paul was back in the area, and he went to the smelter office. He asked if they had any plans or if they would let him try to bring the trees back. The answer from that big industry was “No.”

Paul then went to college to study the science of plants. Unfortunately, his teachers said there weren't any birds or squirrels to spread the seeds. It would be a waste of his life to try to do it. He was told everyone knew that even if he was knowledgeable as he had expected, he wouldn't get his idea accepted.

Paul later got married and had some kids. But, his dream would not die. And then one night he did what he could with what he had. Under the cover of darkness, he went secretly into the wasteland and started planting.

And every week, he made his secret journey into the wasteland and planted trees and grass. For fifteen years he did this against the plain common sense. Slowly rabbits appeared. Later, as there was legal pressure to clean up the environment, the company actually hired Paul to do what he was already doing.

Now the place is fourteen thousand acres of trees and grass and bushes, and Paul has received almost every environmental award Utah has. It took him until his hair turned white, but he managed to keep that impossible vow(誓言) he made to himself as a child.

小题1:When Paul was a boy, _________.

A．he had decided never to leave his hometown

B．the economy of Utah depended on the copper smelter

C．he had determined to stop the copper smelter polluting the area

D．no laws were made to protect the environment against pollution小题2:Why did Paul go to college to study the science of plants?

A．He wanted to find out the best way to save the area himself.

B．He was interested in planting trees since he was young.

C．He wanted to get more knowledgeable people to help him.

D．He thought his knowledge would make his advice more persuasive.小题3:What does the underlined phrase “the plain common sense” in paragraph 5 probably refer to?

A．That his normal work and life would be greatly affected.

B．That it was impossible for trees to grow on the wasteland.

C．That no one would like to join him in the efforts.

D．That he had to keep everything he did secret.小题4:The message of the passage is that ___________.

A．perseverance(持之以恒) will work wonders

B．action speaks louder than words

C．God helps those who help themselves

D．many hands make light work.

矿渣水泥为什么可以放宽SO₃的含量？

( )又称商业循环，是指经济活动沿着经济发展的总体趋势而出现的有规律的扩张和收缩。

A．经济周期

B．经济波动

C．长波循环

D．基钦周期