处理琐事.干家务 2. 洗餐具 查看更多

 

题目列表(包括答案和解析)

为探究植物细胞膜的透性,某同学以红甜菜根(液泡中含有花青素)进行下列实验:
A.将不同切片放在不同温度的蒸馏水中处理1分钟后取出。
B.再分别放在清水中浸泡1小时而获得不同的切片浸出液。
C.测量这些溶液的花青素吸光度,得结果如下图。

请回答以下问题:
(1)上述实验操作步骤的叙述存在着一个明显的不足,没有遵循实验设计的    原则。请你对上述实验中的不准确的操作重新进行叙述:            
(2)由上图中的曲线你可以得出的结论是                    
(3)已知物质A能促进细胞膜上载体的活性。有人认为:经过不同温度的处理是影响了细胞膜上运载花青素的载体的活性。请你借助上述材料设计实验证明该观点是否正确。
材料用具:略。
实验步骤:
                                                                   
                                                                  
                                                                   
(2)预测结果及结论:
                                                                   
                                                                   

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按要求填空。
家务劳动包括哪些内容?
写词组  例如: The chores includes:  
1) ________________________  
2) ________________________  
3) ________________________  
4) ________________________  
5) ________________________

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首字母填空

Do you dream of having beautiful hair like a model? Well, you can have it if you look after your hair in the r  1   way.To get beautiful hair, you first n  2   to get healthy.So start eating good food, and start e  3  .This will make your hair look healthy and full of l  4  .You also need to keep your hair c  5   to make it look nice.But not many people know how to w  6   their hair in the right way.Many people wash their hair t  7   much.This m  8   their hair dry(使…变干)out.You should o  9   wash your hair every day if you have oily(油性的)hair.If you have normal(中性的)or dry hair, you should wash it e  10   two or three days.

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书面表达:根据中文大意,写出意思连贯、符合逻辑、不少于60词的短文.所给英文提示词语供选用.

新年到了,同学们一定有很多想法.请以日记的形式,介绍自己在学习、身体、家务劳动、旅游等方面的计划,并针对自身的不足之处,说说你打算怎么做.

(日记的开头已经给出,其字数不计入所完成的短文内.)

提示词语:study hard, read, healthy food, exercise, help, chores, at home, travel

January 18, 2007  Wednesday                  Sunny

Now, it’s the year of 2007.I have a new plan for the New Year.I am going to ________

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翻译句子

1. 你知道茶吗,就是在水之后世界上最受欢迎的饮品,是偶然之间发明的?

Did you know     tea, the most popular drink in the world (after water), was                 ?

2. 它是3000多年以前由中国的皇帝,神农发明的。

It was invented            Chinese emperor, Shen Nung over          year sago.

3. 飞盘是在20世纪50年代,由大学生发明的。

The     disk was invented by     students in          .

4. 算盘是由中国人民在6世纪时发明的。

The abacus was invented                       by Chinese people.

5. 她喜欢脆的小甜饼,它们硬,干而且易碎。

She likes crispy cookies. They are     ,      and           .

 

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