问题 选择题

如图表示两种气体发生的化学反应,其中相同的球代表同种原子,下列说法正确的是(  )

A.生成物一定是混合物

B.分子在化学变化中不可分

C.化学反应前后原子的种类不变

D.该反应既不是化合反应也不是分解反应

答案

A、由反应的图示可知反应后生成的分子种类只有一种,所以生成物是一种物质是纯净物;

B、由反应图示可知该反应前后分子的种类发生了改变,所以化学反应中分子可以分开;

C、由图示可知反应的前后都含有两种原子,且原子的种类没有改变;

D、由反应的图示可知该反应的反应物是两种生成物是一种,所以该反应是化合反应;

故选C

读图填空题
单项选择题

Declaring that physical exercise is one of the most powerful medicines to help improve our quality of life is not an exaggeration. The World Health Organization expressed the same view in its 2002 World Health Report, emphasizing that the damage produced by lack of physical activity was equal to the p probability of serious illness such as heart disease and even some kinds of cancer.

Those who have embraced an active lifestyle for years are familiar with the sort of physical and psychological benefits that come from exercise. Nevertheless a lot of people would never think of physical activity as a way of feeling better, simply because they don’t think they are in need of it, or because they are lazy or maintain that they haven’t got enough time.

There are many positive effects that result from physical exercise and they are not only concerned with the physical aspects but also psychological and social ones.

Beginning with the physical benefits, physical activity improves the life of the heart, burns off fat, lowers high blood pressure, makes tissues more resistant, and increases muscle flexibility and joint mobility.

On a psychological level, physical activity helps reduce anxiety and stress by causing tension to disappear and by encouraging us to have a better sense of ourselves through listening to our bodies during movement.

Lastly, seeing ourselves in better health is advantageous socially. The sense of satisfaction thus obtained will result in an increase of self-respect and self-confidence in terms of our ability to interact with others.

The benefits linked to exercise have also not gone unnoticed in the business world, with more and more companies setting up gyms on-site. Employees’ improved health translates into better performance and reduced costs as well as an increase in people’s satisfaction in the work place.

Physical activity is recommended for all age groups, including children. It is an important growth factor in a child’s education.

And for the elderly There is no doubt that regular physical activity allows greater efficiency in daily life as well as creating more basic independence day by day, including the possibility of keeping in touch with others and not feeling isolated.

Physical exercise is socially beneficial because ()

A. it gives people competitive advantage

B. it helps people reduce anxiety

C. it enables employees to work better for their company

D. it makes people confident in dealing with others