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[单选题]
The average temperature of this winter is very low, which is only degrees ______ zero.(1分)
A
up
B
at
C
on
D
above
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试题答案：
D
答案解释：
相关题目
23.3 Which of the following might NOT be the question of the experiment mentioned in paragraph three?(2分)
3. Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1 Friction arises when____.(1分)A. an opposing force of motion exists B. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
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21.Of all the family members,grandparents are probably the least valued.They are just the people who have always been around.They make a fuss over the children in the family,show off to their friends the achievements of this child or that child,and show countless pictures of new babies. Grandfathers can fix anything,and grandmothers always have homemade biscuits around.When you are small,it's fun to stay with your grandparents because they always let you do things you can't do at home,and,of course,they buy you things.They are always able to babysit because they don't go out much and actually prefer to see their grandchildren.They are usually good for a small loan now and then doesn't need to be paid back because they turn it into a gift.You respectfully listen to their advice but don't thank them politely for what they do for you,and then don't call or visit them until you need something else.And,of course,you never tell them how dear they are to you because they know how you feel about them anyway.Then all of a sudden,they are no longer there to do the things that only grandparents can do,and you find yourself wishing that you had told them what they meant to you as people and not just as grandparents.(10分)21.1 What is the position of grandparents in the family according to the writer?(2分)A. They are the most important people among family members.B. They are the least important people among family members.C. They are the ones at whom their children or grandchildren usually laugh.D. They are the ones whom their children or grandchildren respect most.
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