问题 填空题

科学家为了研究蛋白A的功能,选用细胞膜中缺乏此蛋白的非洲爪蟾卵母细胞进行实验,处理及结果见下表。

实验组号 在等渗溶液中进行的处理 在低渗溶液中测定卵细胞的水通透速率(cm/s×10-4)
向卵母细胞注入微量水(对照) 27.9
向卵母细胞注入蛋A的mRNA 210.0
将部分Ⅱ细胞放入含HgCl2的等渗溶液中 80.7
将部分Ⅲ组细胞放入含试剂M的等渗溶液中 188.0

已知抗利尿激素通过与细胞膜上的______结合,可促进蛋白A插入肾小管上皮细胞膜中,从而加快肾小管上皮细胞对原尿中水分子的______。

答案

参考答案:受体;重吸收

解析:考察水盐平衡调节。

单项选择题
写作题

第二节读写任务(共1小题,满分25分)

阅读下面的短文,然后按照要求写一篇150左右的英语短文。 

It is exciting to visit different places. As you travel, you will see beautiful sceneries typical of the region. Besides, you can meet and make friends with people of different colors and races. Today people are so fond of traveling that tourism has become one of the developing industries in most countries.

Recent years have seen a tendency in China that tourism is growing faster. According to a recent survey made by some experts, about 47% urban residents travel regularly, and 28% rural residents also make their tour across the country. The survey also shows that more people are interested in tourism, and will join the army in the future.

Facing this tendency, we can't help exploring some underlying factors that are responsible. In the very first place, with the policy of reform and opening up, Chinese people's living standard has greatly been improved, and therefore, most of them can afford to travel around. What's more, it is believed that people now take a more positive attitude to tourism. In addition, tourism facilities are becoming better and better. For example, transportation develops fast, and many scenic spots are available now.

Though there are still some problems with tourism, I personally believe that tourism should be playing a key role in our life. I also hope that our government will make policies to create a better environment for tourists.

[写作内容]

(1) 以约30个词概括短文的要点;

(2) 然后以约120个词就“旅游的好处”的主题发表看法,并包括如下要点:

① 体验不同地方的美景、美食,出国旅游更是给人们提供一个远离祖国的机会;

② 了解风土人情,拓宽历史、地理、生物等知识,增强爱国意识。

[写作要求]

(1) 可以使用实例或其它论述方法支持你的论点,也可以参照阅读材料的内容,但不得直接引用原文中的句子;

(2) 标题自定;

(3) 作文中不能出现真实姓名和学校名称。

[评分标准]    概括准确,语言规范,内容合适,篇章连贯。