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某乙烯裂解炉年运行时间8000小时，每年计划清焦作业5次，每次36小时，烟气排放量42000m3/h，氮氧化物浓度240mg/m3。单台裂解炉在非正常工况时年排放氮氧化物的总量是（ ）。

A.0.01t/A
B.0.36t/A
C.1.81t/A
D.14.51t/A
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单项选择题
Persons who are overweight should watch their diet carefully in order to lose pounds. The best way to do this is to start a weight control program. At first it is wise to talk with your doctor. He can advise you of the number of calories（卡路里）you should have in your meals each day. He can tell you about exercising while on your diet. A good rule is to lose slowly. A loss of a pound or two is plenty.
Plan meals around foods you know. This means that it is wise to include foods that you are used to and that are part of your regular eating habits. When you have lost the weight you wish, simple items can be added to your diet so that you can maintain the weight you want. While you are dieting, try to build a pattern of eating that you can follow later to maintain your desired weight.
When dieting, choose low-calorie foods. Avoid such items as fats, fried food, sweets, cakes, cream and soft drinks. Try to take coffee and tea without sugar or cream. Snacks can be part of your diet. For example, a piece of fruit or a simple dessert saved from mealtime can be eaten between meals.
Keep busy! This way you will not be tempted to go off the diet. Make full use of opportunities to exercise. Try walking instead of riding whenever possible. Happy dieting!
What is the main idea of the passage?（　　）
A.Howtodiet
B.Whyweshoulddiet
C.Whatweshoulddiet
D.Whereweshoulddiet
单项选择题
There are many commonly held beliefs about eye glasses and eyesight that are not proven facts. For instance, some people believe that wearing glasses too soon weakens the eyes. But there is no evidence to show that the structure of eyes is changed by wearing glasses at a young age. Wearing the wrong glasses, however, can prove harmful. Studies show that for adults there is no danger, but children can develop loss of vision if they have glasses inappropriate for their eyes.
We have all heard some of the common myths about how eyesight gets bad. Most people believe that reading in dim light causes poor eyesight, but that is untrue. Too little light makes the eyes work harder, so they do get tired and strained. Eyestrain also results from reading a lot, reading in bed, and watching too much television. However, although eyestrain may cause some pain or headaches, it does not permanently damage eyesight.
Another myth about eyes is that they can be replaced, or transferred from one person to another. There are close to one million nerve fibres that connect the eyeball to the brain, as of yet it is impossible to attach them all in a new person. Only certain parts of the eye can be replaced. But if we keep clearing up the myths and learning more about the eyes, some day a full transplant may be possible.
The word develop is used to mean ____.（　　）
A.becomelarger
B.create
C.train
D.acquire
多项选择题
为了确诊疾病，应选择下列哪种诊断试验
A、假阳性率低的
B、真阴性率高的
C、敏感性高的 
D、阴性预测值高的
E、假阴性率低的
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