组织召开业主大会的程序是什么？

（）承保货物因含有黄曲霉毒素超过进口国对该霉素的限制标准，遭受拒绝进口或当局没收或强制改变用途而造成的损失。

A.拒收险

A.拒收险

C.进口关税险

D.黄曲霉毒素险

In recent years, an increasing number of teenagers have the problem of obesity（肥胖）. This problem shouldn’t be ignored. It’s harmful disorder that can cause a number of health problems in children.

Many factors in life play an important role in developing obesity among teenagers. Generally, obesity happens when a Person uses more calories than he burns up. A child of fat parents is at higher risk to develop obesity. If both the parents are overweight, then there are 80% chances of developing obesity in children. Also, poor eating habits and lack of exercise can develop obesity in teenagers.

Obesity is a serious condition as it can result in many health problems in any age. Fat children are at greater risk of developing diabetes, high blood pressure, heart diseases and breathing problems. A fat child also shows signs such as daytime sleepiness, morning headache, ete.

In addition to these physical effects, obesity in children causes some serious psychological effects. Fat children car often laughed at by other for their being overweight. It can create a low self-esteem in them. It contributes to poor memory and poor performance at school. Also they hate attending the social events.

Obesity among teenagers can be treated by changing diets, increasing physical activities and taking certain medicine. Foods containing fats and high calories should be strictly removed from their diet. However, you should be careful that teenagers should get enough nutrients required for a healthy growth through their diet. You should make sure the children join in more physical activities and exercise. In some severe cases, the drugs should be given only after seeing the doctor.

男，35岁，烧伤总面积70%，Ⅲ°烧伤60%，在院外度过休克期，创面有感染，伤后4天入院，近2天来腹泻、黑粪，以往无溃疡病史。

若上消化道出血被证实，为了明确病变位置及范围，选用最佳检查方法是（）

A.胃十二指肠钡餐检查

B.纤维胃镜检查

C.选择性动脉造影检查

D.CT检查

E.MRI检查

American Museum of Natural History is one of the largest natural and historic museums in the world and one of the main natural history research and education centres in the United States, set up in 1869 and located in the west of the Central Park, Manhattan District, New York. It (1) 7 hectares in its total area, (2) classical types of buildings. The (3) of ancient creatures and humanity is (4) the first place of all the museums in the world, (5) the representative samples from South America, Africa, Europe, Asia and Australia were collected, besides those from the (6) country, the United States.

In the museum, there are five kinds of exhibits, including astronomy, mineralogy, human history, and animals in the (7) times and those in modern times. There are thirty-eight exhibition halls with different (8) from 500 to 1,500 square metres. Besides these, there is a Roosevelt Memorial Hall in (9) of President Roosevelt who supported the (10) of the museum, which is also used to have a special exhibition, showing the new important (11) on natural sciences and (12) affairs and social problems, and special topics connected closely with the life of the citizens. Besides this, it is also used for avocation (13) to have all kinds of scientific activities in the laboratories, centres of natural science and centres for citizens. There are more than 10 (14) research departments mainly (15) for collection of samples, research and work of publication.

In the museum, there are (16) and sub-libraries of Aulspond ancient amniote, with about 300 thousand books and magazines (17) natural history, many of (18) are very valuable monographs for the first edition. It has published many expert books and magazines, and a large number of propaganda materials, (19) which are the two magazines, Natural History and Members of Museum that have the biggest (20) of their magazines.

4（）

A.in

B.of

C.by

D.at

水垢呈黄白色，加盐酸后能缓慢溶解，向溶液中加入氯化钡溶液后，生成大量白色沉淀，这种水垢的主要成分是（）。

A、硝酸盐

B、碳酸盐

C、硅酸盐

D、硫酸盐