下面（）属于变质岩所特有的矿物。A.石墨、滑石、绿泥石、绢云母、蛇纹石 B.石榴子石

市场上出售的“金龙鱼”牌调和油，瓶上标有“5L”字样，若此瓶内调和油的密度为0.92×10³kg/m³，则该瓶油的质量是________kg。 油用完后，若用此空瓶来装水，则可装水________kg。

承保飞机驾驶员由于意外事故致使丧失工作能力或者不能再从事其原来工作而造成的损失的保险是()。

A.机组人员人身意外伤害保险

B.机场经营人责任保险

C.丧失执照保险

D.飞机第三者责任保险

女，32岁，进行性膀胱刺激症状，经抗生素治疗不见好转，且伴有右侧腰部胀痛及午后潮热。

尿液检查对诊断有决定性意义的是______

A．血尿

B．脓尿

C．尿普通细菌培养

D．尿沉渣找结核分枝杆菌

E．尿细胞学检查

阅读理解。

     The human body is a living machine, and, like all machines, it needs "fuel" (燃料) to supply it with energy.

This is provided by the food we eat. But how much do we need to stay healthy?

     The energy value of food is usually measured in calories. A calorie is the amount of heat required to raise

the temperature of 1 kg of water by 1℃. The number of calories people need per day is different. Also, the

number of calories you use at any one moment normally depends on the activity you are in.For example, you

need more calories for standing than for sitting, more for running than for walking, and so on.

     The energy in food is in the form of three kinds of chemical materials-carbohydrate (碳水化合物), protein

(蛋白质) and fat. Carbohydrate provides 3.8 Cal/gm, protein 4.0 Cal/gm, and fat 8.8 Cal/gm. Each food

contains different amount of these materials, as the round pictures show. 

1. The amount of calories supplied by equal amounts of milk, rice, and peanuts is the largest in the case of

    _____.

A. milk

B. rice

C. peanuts

D. rice or peanuts

2. Choose one statement from among A-D that agrees with the passage and the pictures above.

A. You need more calories for swimming than for mountain climbing.

B. Food contains energy in the form of carbohydrates, proteins and fuel.

C. Different people need different amounts of energy depending on their age, sex and the activities they are in.

D. 3 grams of milk provides 16.6 calories because carbohydrate provides 3.8 Cal/gm, protein 4.0 Cal/gm and

     fat 8.8 Cal/gm.

3. This article mainly tells us _____.

A. all the energy is in food

B. the human body needs energy

C. the number of calories depends on your activity

D. we must only eat peanuts to get calories

试述马铃薯品种退化的原因及其防止措施。