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问题 单项选择题

以下哪组症状临床上可诊断为劳力型心绞痛

A．劳动后胸骨后疼痛，持续数分钟自行缓解
B．晚间胸骨后压榨性疼痛，每次持续半小时，含速效救心丸有效
C．在劳力时或情绪激动时胸骨后压榨性痛，经休息3～10分钟缓解，或含硝酸甘油5分钟内缓解
D．经常在心尖部刺痛，瞬间消失，诱因不详
E．情绪激动后胸痛，部位不固定，范围呈点状或条状分布，含硝酸甘油15分钟缓解

答案

参考答案：C

阅读理解

阅读理解。

     We all know that certain oils are healthier than others, but your oil health goes beyond just the type.

The health of your oil can be related to how you use it too.

     Each type of oil has what is called a "smoke point". The smoke point is the specific temperature at

which the oil starts to break down, or in more technical terms, its molecular structure begins to change.

These molecular changes result in changes in flavor, as well as changes in nutritional value-specifically,

the nutritional value of the oil starts to reduce, changing what once may have been considered an

especially healthy oil, like olive, into one that is unhealthy.

     The higher an oil's smoke point is, the higher the temperature of the oil can be.As a result, each type

of oil should be used for the cooking method that is most appropriate to its individual smoke point and

heat tolerance.Here is a quick guide for the next time you reach for your favorite oil.

     Note that the above table represents oils that are refined (精炼的). Most oils we buy are refined.

Refine d oils tend to have much higher smoke points than when they are unrefined.They also differ in

nutrition and flavor.Unrefined oils are more nutritious and they tend to be much richer in flavor.

     When it comes to extremely high heat cooking,always choose oils which are refined.

1. What determines whether an oil is healthy or not?

A. Whether it's refined or not.  

B. Its smoke point.

C. Its molecule. 

D. How you use it.

2. Which of the following might be a better choice to make a healthy salad?

A. Refined walnut oil.  

B. Safflower oil.

C. Unrefined olive oil.  

D. Sunflower oil.

3. Healthy oil can become unhealthy if________ according to the passage.

A. you keep it for too long

B. it is heated well beyond its smoke point

C. it is refined

D. its flavor is changed

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单项选择题

龋齿充填近期出现激发痛和自发痛，多是由于（）

A.充填物过高，形成早接触

B.未恢复接触点或形成颈部悬突

C.备洞过程中产热过多

D.继发龋伴牙髓炎

E.充填物压得不紧
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