心脏射血时，大动脉内所呈现的最高压力称 ()A．收缩压 B．舒张压 C．脉搏压

下面四幅图中，地球的自转方向正确地是（   ）

阅读理解。

     It was the old lady's eightieth birthday. She was sure Myra wouldn't forgot her mother's birthday,

even if she was busy. After all, eighty was a special birthday. Perhaps Myra might come. Even if Myra

did not come, she would send a present. The old lady was sure of that. Two spots of colour brightened

her cheeks. She was excited like a child.

    Mrs. Morrison had brought a card and a bunch of flowers when she came to do the breakfast. Mrs.

Grant downstairs had made a cake. Johnnie, the little boy next door, was now up with her with a packet

of sweets.

    "I guess you'll get lots and lots of presents, " he said. "I did last week when I was six."

    What would she like? A pair of slippers, perhaps. A blue new cardigan. Or a table lamp. Or a little

clock, with clear black numbers. So many lovely things.

    She stood by the window, watching. The postman turned round the corner on his bicycle. Her heart

beat fast. Johnnie had seen him too and ran to the gate.

    "Granny, granny, " Johnnie returned. "I've got your post!"

    He gave her four envelopes. Three were from old friends. The fourth was in Myra's writing.

    "No parcel(包裹), Johnnie?"

    "No, granny."

     Almost reluctantly, she tore the fourth envelope open. Folded in the card was a check. Written on the

card was a message: Happy Birthday-Buy yourself something nice with the check, Myra and Harold.

     The six-figure check fell to the floor like a bird with a broken wing. Slowly the old lady bent to pick it

 up. Her present, her lovely present. With trembling fingers she tore it into little bits.

1. As can be inferred from the passage, _______.

A. the old lady lived alone in a flat away from her daughter

B. the friends sent the old lady many lovely presents by post

C. Myra was stopped by her husband from seeing her mother

D. the neighbours cared little about the old lady in daily life

2. The old lady felt _______ when she saw no packet came with her daughter's card.

A. excited

B. happy

C. disappointed

D. impatient

3. Which of the following might serve as the best title for the passage?

A. The Present

B. The Check

C. The Birthday

D. The Daughter

4. The reason why the old lady tore the check into small pieces was that _______.

A. she was sure her daughter would come, not the check

B. she didn't notice there were six figures on the check

C. she didn't think the check was large enough for a present

D. she would prefer a present with love from her daughter  

前后台型结构

下述关于指令字长度的描述中不正确的是（）。

A.指令所包含的二进制数码的位数称为指令字长度的长度

B.同一台机器上不同指令字长度是不一样的

C.指令字长度与机器字长有着密切的关系

D.指令字长度越大，其执行速度越快

限额赔偿：（）