离心泵大修后的验收方法正确的是（）。A、检查进出口阀是否安装好 B、检查润滑油系统是

阅读理解。

     Sometimes, people are not clear about what kind of food is healthy and what kind of food may do harm

to our health. The USDA has prepared a food guide to help people learn about which kind of food is the

healthiest to eat. The food guide describes six main food groups: meat ( like fish and chicken), dairy ( like

milk and cheese),grains (like bread and rice),fruit, and vegetables. The last group is fats and sweets. The

USDA also suggests how much of each food group is healthy to eat daily. Though this guide was prepared

by the US government, it is very useful for people all over the world.

     (1) As a result of years of study, we know that too much animal fat is bad for our health. For example,

Americans eat a lot of meat and only a small amount (量) of grains, fruit and vegetables. Because of the way

they eat, they have a high rate (率) of cancer and heart disease. In Japan, people eat large amounts of grains

and very little meat. The Japanese also have a very low rate of cancer and heart disease. The Japanese live

longer than anyone else in the world. However, when Japanese people move to the US, the rate of heart disease

and cancer goes up as their eating habit changes. And as hamburgers, ice creams and other high-fat foods

become popular in Japan, the rate of heart disease and cancer is going up there as well. (2) People are also

eating more meat and dairy food in other countries, in those countries the disease rate is going up with the

change of people's eating habit. Doctors everywhere suggest people eat more grains, fruit and vegetables and

less meat and dairy food.

     (3) Eating healthily is important for children as well as their parents. When parents have poor eating habits,

their children usually do, too. After all, children eat the same way as their parents. When parents eat healthy

food, the children will learn to enjoy it, too. Then they will develop good eating habits. Doctors suggest parents

give their children healthier food such as fruit, vegetables and juice.

     Everyone wants to live a long, healthy life. We know that the food we eat affects (影响) us in different

ways. For example, doctors believe that fruit and vegetables can really protect people from many different

diseases. On the other hand, animal fat can cause (引起) diseases. We can change our eating habits now and

enjoy many years of healthy living.

1. 将(1)处的句子翻译成汉语。

    ___________________________________________ 

2. 将(2)处的句子改写为含定语从句的句子。 

    ___________________________________________ 

3. 将(3)处的句子改写成同义句。 

    ___________________________________________ 

与急性肾小球肾炎有关的细菌是

A．大肠杆菌

B．绿脓杆菌

C．金黄色葡萄球菌

D．β-溶血性链球菌

E．表皮葡萄球菌

放射免疫分析中标记物的使用为（）

A.核素标记抗原

B.核素标记抗体

C.限量

D.等量

E.过量

身肿，腰以下为甚，面色萎黄，神倦肢冷，小便短少，脘腹胀闷，应用何方治疗（）

A.黄芪建中汤

B.实脾饮

C.黄芪汤

D.真武汤

E.越婢汤

开关二极管加正向偏置电压导通，加反向偏置电压截止。