Step 1 Review 第一步 复习 1.T:I exercise every day and my favorite sport is swimming. My favorite sports player is Luo Xuejuan. She is from- Can you talk about your favorite sports and sports players? Who would like to have a try? S1: My favorite sport is basketball. My favorite sports player is Yao Ming. He is from- S2: My favorite sport is table tennis. My favorite sports player is Deng Yaping. S3:My favorite sport is- My favorite sports player is- He/She is from- My favorite sport is- My favorite sports player is- He/She is from- T: Pretty good! Who would like to introduce your exercise timetable? S4:I get up at 5∶30 in the morning. Then I run for about half an hour. S5:I get up at 6∶00 in the morning. Then I go out for a walk. S6:I get up very late. So I don’t do morning exercises. But in the afternoon, after class, I play soccer with my good friends. S7: - T: Very good. Now, who can tell me why you do exercise? S8: I want to be strong. S9: I want to be healthy. S10: I want to be tall. S11: I want to be a sports player like Yao Ming. S12: - T: Excellent! Do you know why I exercise every day? Can you guess? S13: I think you want to be healthy. S14: I think you want to keep fit. S15: I think you want to be thinner. T: Yes, you are all right. I do exercise because Beijing will host the 2008 Olympics. We must exercise and learn English well. 查看更多

 

题目列表(包括答案和解析)

如图甲表示某生物膜结构,图中A、B、C、D、E、F表示某些物质,a、b、c、d表示物质跨膜运输方式。图乙和图丙表示物质运输曲线,请据图回答:


(1)若图甲是癌细胞的细胞膜,则膜上含量较正常细胞减少的物质是[  ]    
(2)若图甲是线粒体膜,b和c过程运输的气体分别是    。b、c运输方式符合图    所表示的物质运输曲线。
(3)若图甲表示人体红细胞膜,则表示Na、K运输的分别是图中      。Na、K的运输方式符合图    所示曲线。
(4)已知红细胞吸收葡萄糖是协助扩散,而有人认为小肠上皮细胞以主动运输的方式吸收葡萄糖,请设计实验加以确定。
①实验步骤:
第一步:取甲、乙两组生理状况相同的小肠上皮细胞,放入适宜浓度的含有葡萄糖的培养液中。
第二步:甲组细胞给予正常的呼吸条件,         
第三步:                
②预测实验结果并分析:
a.若甲、乙两组细胞对葡萄糖的吸收速率基本相同,则         
b.                                

查看答案和解析>>

(10分)植物具有向重力生长的特性,下列是研究根向重力生长机理的两个实验。
实验一:将空白琼脂和含EDTA的琼脂做成帽状,分别套在甲、乙两组玉米胚根的根冠外(示意图如下)。提示:EDTA的作用是去除与其临接部位的 Ca2+

将胚根水平放置培养一定时间后,观察到甲组胚根向重力(下)生长,乙组胚根水平生长。根据上述实验结果,得出实验结论:                               
  实验二:水平放置的胚根弯曲向下生长,与根冠近地侧的Ca2+浓度明显高于远地侧有关。研究表明,根总是朝着Ca 2+浓度高的方向弯曲生长。为验证这一结论,有人设计了下列实验方案。请根据提供的实验材料和用具,写出第二步及以后的实验步骤和实验结果,并回答问题。
(1)实验材料和用具:胚根等长的萌发玉米种子,空白琼脂帽,含EDTA的琼脂帽,上面部分含Ca2+的琼脂帽(水平方向),培养皿等。
(2)实验步骤:
  第一步:取若干个培养皿,在每个培养皿中放置适量的萌发玉米种子,按实验一中乙组的方法处理胚根一定时间后,移去根冠外的琼脂帽。然后将培养皿平均分成两组,编号为 A组、B 组。 
  第二步:                                                            
  第三步:                                                            
(3)实验结果:                                                         
(4)科学家进一步证实,根冠中生长素的分布受Ca2+浓度影响,当胚根水平放置时,重力诱导Ca2+向根冠下侧移动,导致近地侧的生长素浓度比远地侧高。请分析胚根的生长素分布与向重力生长的关系:                                  

查看答案和解析>>

阅读短文,在其后空白处写出各单词的正确形式。单词的第一个字母已经给出。
The worst traveler in the world was Paul of San Francisco. Once he f____【小题1】 from the U.S. to his hometown in Italy to see someone at home. The plane made a one-hour stop to get oil at an airport in New York. Paul thought he was in Rome. C____【小题2】, he got off the plane.
When nobody was there to meet him, Paul thought maybe the heavy t____【小题3】 made his friends late. While looking for their address, Paul found that the old “Rome”had changed a lot. He found many high m____【小题4】 buildings instead of old ones. He also found that many people spoke English but not Italian and that many street signs were w____ 【小题5】 in English.
Paul knew very l____【小题6】 English. So he asked a policeman in Italian the way to the bus station. He happened to meet a policeman who was also born in Italy and answered in the same l____【小题7】.
After twelve hours’ traveling round on a bus, the driver handed him over to a____【小题8】 policeman. But this time, this policeman could only speak English. So paul asked the policeman why the Rome police employed(雇佣)so many people who spoke English as policemen.
Paul didn’t b____【小题9】 he was in New York when he was told so. To get him on a plane to Italy, he was s____【小题10】 to the airport in a police car.

查看答案和解析>>

短文填空 (共10分,每空1分)

come, fall, sit, look, be, walk, jump, sell, hear, drop

  根据短文内容,用方框中所给词的正确形式填空,使短文完整、正确。(每个词只能用一次)(共10分,每小题1分)

  Early in the morning, Mr. Black was carrying a big basket of cabbages to the market. She hoped 1.___them to the people from town.

  The mountain road was narrow(狭窄的)and the old woman 2.___carefully. Suddenly she 3.___a loud bell. It passed her and very fast down the hill. The old woman had to 4.__to one side of the road so quickly that the basket of cabbages nearly 5.___into the valley.

  She saw a young boy 6..___on the bicycle without even 7.___round to see if the old woman was all right.

  The old woman shouted, 8.___back.”

  “What 9.___it?” the boy asked impolitely, pushing his bike towards the old woman.

  “What did I drop?”

  “Little boy, you 10.___your manner.” The old woman answered.

 

 

查看答案和解析>>

根据题意补全下列单词

1.W    you like to go to the cinema??

2.That's a great i   .?

3.—W    is the film??

—On Sunday.?

4.—W    is the magic show??

—At Sun Theatre.?

5.S    is the last day of the week.

 

查看答案和解析>>


同步练习册答案