问题 单项选择题

下列各种情况下对流传热系数由大到小的正确顺序应该是()。

①空气流速为30m/s时的α

②水的流速为1.5m/s时的α

③蒸气滴状冷凝时的α

④水沸腾时的α

A.③>④>①>②

B.④>③>②>①

C.③>④>②>①

D.③>②>④>①

答案

参考答案:C

阅读理解

阅读理解。

     Some doctors  think  that you should drink a glass of  water each morning .You should drink this

water  first  before doing anything else.The  temperature  of  the  water  should  be  similar  to  body

temperature: not hot,not cold.Why should we drink this water? Water helps your body in many ways.

It helps clean out your kidneys (肾).It prepares your stomach for digestion (消化).Water can also

help your intestines (肠) work better.After drinking water,the intestine can more easily get nutrient (营养) from your food.And water helps us to go to the bathroom more easily.

     Scientists suggest that people take in 1,600 milliliters of water each day.But don't drink all of that

water in one sitting.If you do,your kidneys have to work much harder.It's better to drink some in the

morning and some in the afternoon.Some people think  it's  better  to  drink  between  meals and not

during meals.They think water makes the juice produced  in  our stomachs thinner.It is no good for

the digestion.

     Are you drinking enough water every day? Check the color of your urine (尿).If it is light yellow,

you are probably drinking enough.If it is dark yellow,you probably need more water.A little more

water each day could make you much healthier.

1.What could be the title for this reading?

A.Drink Water,Not Soft Drinks!  

B.Drink During Meals.

C.Drink Between Meals.            

D.Drink Enough Water.

2.Why is it helpful to drink water in the morning?

A.Your kidney will work harder.  

B.Your intestines will work well.

C.Your juice will be made thinner.  

D.Your urine will be pale yellow.

3.Which of the following is NOT the reason to drink water?

A.So your intestines will work well.

B.To get more nutrient.

C.To clean out your kidneys.      

D.To make your juices thinner.

4.Why is it better to drink between meals?

A.So you eat enough food.        

B.So you don't make your juice thinner.

C.So you urine will not smell bad  

D.So you don't overwork your kidneys.

5.Why is dark--colored urine a sign to drink more water?

A.It shows our body is unhealthy.

B.It means our kidneys are working too hard.

C.Less water makes the color darker.

D.It is the same color as our digestive juices.

问答题 简答题