(复习圣诞节的庆祝方式.) T: Christmas is the most important festival in western countries. How do people celebrate it? What do people do before Christmas? S1: They give Christmas cards to their friends and decorate Christmas trees. T: What do people do on Christmas Eve? S2: Go to church, put up stockings. T: What do people do on Christmas? S3: Children open the presents in the stockings and give the gifts to each other. 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.                                

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根据句子及所给单词首字母写出单词的正确形式

The t    must stop when the lights are red.

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根据句子意思及所给首字母填入适当的词:

Many t     of trees are planted every year in our country.

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根据汉语句子填入适当单词完成句子,每空一词.

不要嘲笑处于困境中的人.

Don't ________ ________ the people in trouble.

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阅读理解填词。先跳读短文,然后根据上下文在文下空白处写出各单词的正确形式,单词的第一个字母已给出。

There are many d   1   kinds of stars in the world, such as(诸如)singing stars, f   2   stars and football stars.T   3   are famous(著名的)people and many people like them.As we know, Michael Jackson is a singing star b   4   he sings very well.Julia Roberts is a film star because she acts(表演)q   5   well.David Beckham is a football star because he p   6   football well.People all over(遍及)the world like David Beckham because he is not only(不但)very handsome(英俊潇洒的)but also(而且)t   7  .He h   8   a h   9   family.His wife is Victoria Beckham, a member of the Spicy Girls.They have three s   10  

1.________ 2.________ 3.________ 4.________ 5.________

6.________ 7.________ 8.________ 9.________ 10.________

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