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问题 选择题

读图2-43，回答12～13题。

12．图中四点属于暖气团控制下的是(   )

A．①③                  B．②④   

C．①④                  D．②③

13．若图中甲点是低压中心，则下列叙述正确的是(    )

A．此图表示的天气系统是北半球的气旋

B．此图表示的天气系统是南半球的反气旋

C．图中甲地出现阴雨天气

D．图中甲地盛行下沉气流

答案

12．A 13．C

冷锋是冷气团主动向暖气团移来， 三角箭头指向暖气团一侧；暖锋是暖气团主动向冷气团移来，半圆指向冷气团一侧。

这是一幅锋面气旋图，根据锋面的移动方向判断出该气旋水平方向上气流的运动方向为顺时针，所以判断为南半球的气旋。 气旋的中心盛行上升气流，多阴雨天气。

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 A1/A2型题

以下哪项会减弱紫外线的红斑反应（）

A.妊娠期

B.服用肾上腺皮质类固醇

C.长期室内工作者

D.甲状腺功能亢进

E.照射腹部皮肤
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