培根说：“疑而能问，已得知识之半。”这句名言对我们学习的启示在于要（） A.端正学习

取一滴鱼的血液滴在洁净的载玻片上，然后另取一块载玻片把血液推成薄膜，置于显微镜下观察，这种玻片标本属于：（　　）

A．切片

B．装片

C．涂片

D．磨片

Elizabeth and I are 18 now, and about to graduate．I think about our elementary-school friendship, but some memories have blurred （模糊）．What happened that day in the fifth grade when Beth suddenly stopped speaking to me? Does she know that I've been thinking about her for seven years? If only we could go back, and discover what ended our relationship．

I have to speak with Beth．I see her sometimes, and find out school is "fine"．It's not the same．It never will be．Someone says that she's Liz now．What happened to Beth?

I can't call her．Should I write? What if she doesn't answer me? How will I know what she's thinking?

Yes, I'll write her a letter．These things are easier to express in writing．" Be-," no, " Li-," no, " Elizabeth," I begin．The words flow freely, as seven year old memories are reborn．I ask her all the questions that have been left unanswered in my mind, and pray she will answer．I seal my thoughts in the perfect white envelope, and imagine Beth looking into her mailbox．Will she know why I'm writing? Maybe she once thought of writing the same letter．

As the mailman takes my envelope from me forever, I wonder if I've made the right decision．Do I have the right to force myself into Beth's life again? Am I simply part of the past? I have taken the first step．Beth has control of the situation now．

One day has passed．Are my words lying on the bottom of the post office floor?

Two days are gone．I'm lost in thought and don't even hear the phone ting．

"Hello? It's Elizabeth．"

小题1:What can we learn about Beth?

A．She had a quarrel with the author in the fifth grade．

B．She moved to another school in the fifth grade．

C．She is now called Liz instead of Beth．

D．She hasn't seen the author for seven years．小题2:Why does the author decide to write a letter instead of calling?

A．She is sure that Beth will not answer．

B．She's afraid that they'll quarrel on the phone．

C．She doesn't know Beth's telephone number．

D．It is easier to express her feelings in writing．小题3:Which of the following the author might NOT mention in her letter?

A．Their elementary-school friendship．

B．Her future plan after graduation．

C．Her expectations for Beth's reply．

D．The questions about the endings of their friendship．小题4:What might happen at the end of the story?

A．Beth answers her letter two days later．

B．The letter doesn't reach Beth at all．

C．They make up their friendship．

D．Beth refuses to make peace with her．

一组封闭的且高程由外向内逐步增加的等高线表示（）。

A.山谷

B.山脊

C.鞍部

D.山头

两个或两个以上的平等主体之间就劳务事项进行等价交换过程中形成的一种经济关系，属于( )。

A．劳动关系
B．劳务关系
C．主体关系
D．客体关系

煤矿应当建立健全领导（）下井制度，并严格考核。

A．不定期

B．带班

C．定期