问题 填空题

仔细观察,你会发现鱼的口和鳃盖后缘始终是一张一合,交替进行,这实际上是鱼在进行______,所以经鳃流出的水流与由口流入的水流相比,______含量减少,______含量增加.

答案

鱼类终生生活在水中,观察活鱼,可以看到鱼的口和鳃盖后缘有交替闭合的现象,这是鱼在呼吸.鱼用鳃呼吸,鳃上有许多鳃丝,鳃丝里密布毛细血管,当水由口流进,经过鳃丝时,溶解在水里的氧就渗入鳃丝中的毛细血管里,而血里的二氧化碳浸出毛细血管,排到水中,随水从鳃盖后缘的鳃孔排出体外,所以鱼类不停地吞水实际是在呼吸.

故答案为:呼吸;氧气;二氧化碳

单项选择题
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From poor beginnings to most expensive player

ZINEDINE Zidane,who dreams of leading France to its second World Cup title in a row next month,has always preferred to express himself with a football rather than with words.

Last Wednesday Zidane scored the decisive goal when Real Madrid of Spain won the Champions League final against Germany's Leverkusen 2一1.

He became one of the world’s most expensive players when he joined Real Madrid from Italy's Juventus for US $ 66 million.And he has been a national hero since he scored twice in the 3-O defeat of Brazil in the 1998 World Cup Final.

But despite his success,Zidane has always kept his feet on the ground.He leads a quite family life,there is hardly any gossip about him and he avoids putting his wife and two children in the spotlight.

“Just because I'm a public figure it doesn't mean I have to express myself on everything.I don't like to discuss some personal matters publicly.”he said.

Even as a child playing football in the slum area of Marseille,France,where he was raised by his Algerian parents,Zidane was shy.

He loved football even as a little kid.“I realized football is a wonderful mixture of a sharp mind and hard training rather than just talking,”he said.

Even when the match awards were just chocolate and bread,Zidane found that football made his poor childhood rich.

Before he was 10 years old,it was obvious that he could become a great footballer.He was offered his first professional contract(合同)when he was just 20.Now,at the age of 29,he has already picked up two World Player  of the year awards.

This quiet striker has not yet spoken of his hopes for the coming World Cup.But his fans across the world will be eagerly watching him to see what he'll do this time.

小题1: What did Zidane learn from his childhood football experience? He learned that_____________.

A.he could become a great footballer

B.he could become rich if he became a footballer

C.football is a mixture of a sharp mind and hard training but not just talking

D.football is a favorite sport in the future小题2:According to the article,what are Zidane’s main characteristics?

A.He is a shy but successful man.

B.H e loves his wife and children.

C.He doesn't like to speak in public.

D.He is a quiet,down—to earth person of few words.小题3: When the writer says“Zidane has always kept his feet on the ground”,he means_________.

A.Zidane spends more time standing than sitting most days

B.Zidane is a down-to earth person

C.Zidane has spent most of his time training on the pitch

D.Zidane likes standing when he succeeds小题4:The sentence“Zidane found that football made his poor childhood rich”means___________.

A.football made Zidane's poor family wealthy when he was a child

B.Zidane knew that football could bring him fame and wealth even when he was a child

C.football brought happiness to Zidane when he was a child in a poor family

D.Zidane knew that if he wanted to be rich he must play football from childhood