一袋大米的34正好是75千克，这袋大米重______千克．

在保修期内，商品经过一定次数的修理仍不能正常使用的，经营者应当负责更换或者退货。这一次数为( )。

A．一次

B．两次

C．三次

D．四次

没有钓住那条鱼

       我首次钓鱼旅行的情景至今依然历历在目，仿佛刚刚发生在昨天一般。     

       记得那是初秋时节的一天，温煦的阳光静静地照耀着树林，在地上投下长长的阴影，使我们觉得格外凉爽惬意。    

        多年的垂钓经历使叔叔深谙何处小狗鱼最多，他特意将我安排在最有利的位置上。我模仿别人钓鱼的样子，甩出钓鱼线，眼巴巴地等候鱼儿前来叮食。好一阵子什么动静也没有，我不免大为失望。     

        突然间，好像有什么东西在拽我的钓线，旋即一下子将它拖入了深水之中；我连忙往上一拉鱼竿，立刻看到一条逗人爱的小狗鱼在璀璨的阳光下活蹦乱跳。“叔叔！”我掉转头，欣喜若狂地喊道，“我钓住了一条！”“还没有哩。”叔叔慢条斯理地说。他的话音未落，只见那条惊恐万状的小狗鱼鳞光一闪，便箭一般地射向了河里。钓线上的鱼钩不见了。我功亏一篑，眼看快到手的捕获物又失去了。

       我感到分外伤心，满脸沮丧地一屁股坐在草滩上。叔叔重新替我缚上鱼钩，安上诱饵，又把鱼竿塞到我手里，叫我再碰一碰运气。     

      “记住，小家伙，”他微笑着，意味深长地说，“在鱼儿尚未被拽上岸之前，千万别吹嘘你钓住了鱼。我曾不止一次看见大人们在很多场合下都像你这样，结果干了蠢事。事情未办成之前就自吹自擂一点用也没有；纵然办成了也毋需自夸，这不是明摆着的么？”    

        打这以后，每当我听到人们为一件尚未办成的事情而自我吹嘘时，就情不自禁地回忆起小河边垂钓的那一幕，回忆起叔叔那一席格言警语般的忠告：“在鱼儿尚未被拽上岸之前，千万别吹嘘你钓住了鱼。” 

1．联系上下文，理解下列词语的意思。

深谙（ān）：                                                                               

眼巴巴：                                                                                   

欣喜若狂：                                                                                 

2．钓鱼的过程中，作者的心情不断发生变化，你能从文中体会出来吗？ 

（        ）→（        ）→（        ）

 3．“在鱼儿尚未被拽上岸之前，千万别吹嘘你钓住了鱼”的正确含义是   [ ]

A．在鱼儿没有拽上岸之前就吹嘘钓住了鱼别人会笑话的。   

B．等鱼儿被拽上岸来，再吹嘘也不迟。   

C．叔叔教育“我”事情未办成之前不要自吹自擂，即使办成了也不必自夸。 

4．为什么“打这以后，每当我听到人们为一件尚未办成的事情而自我吹嘘时，就情不自禁地回忆起小河垂钓的那一幕”呢？

“Can I see my baby?” asked the happy new mother. The bundle was placed in her arms and when she moved the fold of cloth to look upon his tiny face, she gasped—the baby had been born without ears. Time, however, proved that the baby’s hearing was perfect except his appearance．

One day when he rushed home from school and threw himself into his mother’s arms，he cried out bitterly，“A boy, a big boy…called me－a f—…freak．”She sighed, knowing that his life was to be endless of heartbreaks．

He grew up，handsome for his misfortune．A favorite with his fellow students, he might have been class president, but for that．He developed a gift for literature and music．

The boy’s father had a talk with the family doctor．Could nothing be done? “I believe we could graft on a pair of outer ears，if they could be donated，”the doctor decided．So the search began for a person who would make such a sacrifice for a young man．Two years went by．Then, “You’re going to the hospital，son．Mother and I have someone who will donate the ears you need．But it’s a secret,” said the father．

The operation was a brilliant success．His talents blossomed into genius．School and college became a series of successes．Later he married and entered the diplomatic service．“But I must know!” he urged his father．“Who gave so much for me? I could never do enough for him．”

“I do not believe you could,” said the father，“but the agreement was that you are not to know…not yet．”The years kept the secret, but the day did come …one of the darkest days that ever passed through a son．He stood with his father over his mother’s casket(棺材)．Slowly and tenderly，the father stretched forth a hand and raised the thick，reddish-brown hair to let out the secret．

小题1:.

When the mother unfolded the cloth and looked upon the tiny face we know that the mother________．

A．suddenly decided to make a sacrifice for the baby

B．kept the baby’s situation unknown to others

C．felt shocked and disappointed to see her new baby

D．complained of her bad luck and regretted having a disabled child小题2:.

Give the closest meaning to the underlined word “freak” in Paragraph 2．

A．Slow–acting person.

B．Ugly–looking child.

C．Badly–behaved student.

D．Strangely–shaped creature.小题3:.

At last, we may infer from the passage that_________.

A．The agreement was between the donator and the family

B．Finally the boy came to know the donator was a stranger

C．The mother may never let her hair be cut to keep her ears from being seen

D．The mother donated her ears to her son after she died小题4:.

What moral lesson can we draw from this reading?

A．Real love lies in what is done unknown rather than what is done known．

B．It is up to parents to help their children heart and soul．

C．True beauty lies only in the heart not in appearance．

D．It is a virtue for young generations to learn to be grateful．

系统延迟是一个固定值。如果数值偏小对机载测距设备测距的正确度（）。

A.使实测的距离等于实际的距离

B.使实测的距离小于实际的距离

C.使实测的距离大于实际的距离

D.不会产生影响

生产过程中生产或使用的有毒物质称为（　　）。

A．金属毒物

B．有机溶剂毒物

C．生产性毒物

D．高分子化合物毒物