简单扩散、协助扩散、主动运输的概念是什么这些运输方式各有什么特点

教师在进行“水墨画(1课时)”教学时，不合适的教学活动是（ ）。

A．讲解中国画的审美理想

B．介绍水墨画的艺术特征

C．示范中国画的笔法和

D．讲授文房四宝的品鉴方法

下列哪种疾病是既往可能不存在，确实是人类新发现的传染病（）。

A.戊型肝炎

B.军团病

C.流行性出血热

D.莱姆病

E.艾滋病

影响用双倍余额递减法折旧率的因素是( )。

A．残值率

B．已使用年限

C．预计使用年限

D．尚可使用年限

综合性学习。

　　为纪念世界反法西斯战争胜利66周年，凤凰中学九年级（1）班将开展一次以“世界何时铸剑为犁”为主题的综合性学习活动，请你根据要求推断字义。

　　“武”字与战争密切相关，许慎在《说文解字》中把“武”解释为“止戈为武”，这一解释反映了古人向往和平幸福生活的情感，“伐”字也与战争有关，请你推断它的字义：_______________________。

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Recently some American scientists have given a useful piece of advice to people in industrialized nations,

They say people should eat more of the same kind of food eaten by humans living more than 10,000 years ago.

1_____

     The scientists say that the human life has changed greatly. Our bodies have not been able to deal with these

changes in lifestyle and this had led to new kinds of sicknesses. 2_____ So they are called "disease of

civilization". Many cancers and disease of blood system are examples of such diseases.

     Scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very little alcohol or

tobacco, probably none. 3_____ However, a change in food is one of the main differences between life in

ancient times and that of today.

     Stone Age people hunted wild animals for their meat, which had much less fat than domestic ones. They

ate a lot of fresh wild vegetables and fruits. They did not have milk or any other dairy products, and they made

very little use of grains. 4_____ We eat six times more salt than our ancestors (祖先). We eat more sugar. We

eat twice as much fat but only one third as much protein and much less vitamin C. 

     5_____ But scientists say that we would be much healthier if we eat much the same way as our ancestors

did, cutting the amount of fatty, salty and sweet food.

A. These new sicknesses were not known in ancient times.

B. People today probably do not want to live the way people thousands of years ago did.

C. Ancient people also lived in large groups.

D. But today, we eat a lot of these.

E. Ancient people also got a great deal of physical exercise.

F. In that case, they would live much healthier.

G. People today probably live the same life as people thousands of years ago did.