在扑救医院灭火战斗中，疏散工作应坚持（）和受烟火威胁大的人员在先。A、一般患者 B、

已知：关于x的方程x²-2（m+1）x+m²-3=0．

（1）当m为何值时，方程总有两个实数根？

（2）设方程的两实根分别为x₁、x₂，当x₁²+x₂²-x₁x₂=78时，求m的值．

药物与血浆蛋白结合后会发生哪些变化（）

A.影响药物代谢

B.有利于药物吸收

C.不能透过血-脑屏障

D.活性增加

E.影响药物排泄

阅读下面的段落，完成练习。     

       敬爱的周 * * 生前用的被子是几十年前的旧被子，被面也破了。棉絮有很多小窟窿，服务员想给 * * 换床新被子，可是 * * 说什么也不肯。‖有一回， * * 的皮鞋坏了，他又不让买新的。服务员只好等 * * 休息后，才拿到外面去修，修好了再给 * * 穿。‖又有一次， * * 去外地开会，随身带了毛巾等用品，工作人员见 * * 的毛巾已经破了，提出换条新的。 * * 笑笑说：“还可以嘛，不用换。”那个工作人员手拿这条毛巾，望着 * * 慈祥的面容，眼眶里滚动着泪花。‖ 

(1)这段文章介绍了周 * * 生前用过的                  、                  、                 这些物品，所以分这三层。 

(2)这三层意思都是围绕 * *                        这方面品质写的。这段的段意可概括为：                            。

The morning had been a disaster. My tooth was aching, and I’d been in an argument with a friend. Her words still hurt: “The trouble with you is that you won’t put yourself in my place. Can’t you see things from my point of view?” I shook my head stubbornly（固执地）and felt the ache in my tooth. I’d thought I could hold out till my dentist came back from holiday, but the pain was really unbearable. I started calling the dentists in the phone book, but no one could see me immediately. Finally, at about lunchtime, I got lucky.

“If you come by right now,” the receptionist said, “the dentist will fit you in.”

I took my purse and keys and rushed to my car. But suddenly I began to doubt about the dentist. What kind of dentist would be so eager to treat someone at such short notice? Why wasn’t he as busy as the others?

In the dentist’s office, I sat down and looked around. I saw nothing but the bare walls and I became even more worried. The assistant noticed my nervousness and placed her warm hand over my ice-cold one.

When I told her my fears, she laughed and said, “Don’t worry. The dentist is very good.”

“How long do I have to wait for him?” I asked impatiently.

“Come on, he is coming. Just lie down and relax. And enjoy the artwork,” the assistant said.

“The artwork?” I was puzzled.

The chair went back. Suddenly I smiled. There was a beautiful picture, right where I could enjoy it: on the ceiling. How considerate the dentist was! At that moment, I began to understand what my friend meant by her words.

What a relief!

小题1:Which of the following best describes the author’s feeling that morning?

A．Upset.

B．Nervous.

C．Satisfied.

D．Cheerful.小题2:What made the author begin to doubt about the dentist?

A．The laughing assistant of the dentist.

B．The dentist’s being as busy as the other dentists.

C．The surroundings of the dentist’s office.

D．The dentist’s agreeing to treat her at very short notice.小题3:What did the author learn from her experience most probably?

A．Strike while the iron is hot.

B．Put oneself in others’ shoes.

C．Have a good word for one’s friend.

D．A friend in need is a friend indeed.

2%戊二醛达消毒效果的时间需（）。

A.10～30分钟

B.40～50分钟

C.1～2小时

D.3～4小时

E.4～10小时