题目内容

—Are we about to have dinner?  

—Yes, it ________ in the dinning room.

A. is being served   B. is served C. is serving       D. serves

A


解析:

因serve与it(dinner)是动宾关系,要用被动语态;由问句中的are about to(即将)和答语Yes可知,已“在”供应dinner了,故用现在进行时的被动语态。

练习册系列答案
相关题目

ABCD请按实际情况填写。其他请参照下表填写。
A, B, C, D, E(AB), F(AC)

A. Control of Respiration
B. Basic tips for preserving cut flowers
C. Role of Respiration
D. Most Important Aspect of Flower Care
E. Need for Clean Water
F. Ways of Stopping Respiration
【小题1】
While everybody enjoys fresh cut flowers around his house, few people know how to keep them for as long as possible. This may be done by keeping in mind a few simple facts. The key to keeping fresh cut flowers for a week or more without floral preservatives(which contain biocides that kill bacteria and fungus) is to keep the water fresh and the stems free of air pockets so they can continue to draw up water.
【小题2】
An important thing to remember about cut flowers is that they are sensitive to temperature. For example, studies have shown that cut carnations(康乃馨) retain their freshness eight times longer when kept at 12℃ than when kept at 26℃. Keeping freshly harvested flowers at the right temperatures is probably the most important aspect of flower care.
【小题3】
Flowers are not intended by nature to live very long. Their biological purpose is simply to attract birds or insects, such as bees, for pollination (授粉). After that, they quickly dry up and die. The process by which flowers consume oxygen and produce carbon dioxide, called respiration (呼吸), generates the energy the flower needs to give the flower its shape and colour. The making of seeds also depends on this energy. While all living things respire, flowers have a high level of respiration. A result of all this respiration is heat, and for flowers the level of heat relative to the mass of the flower is very high. Respiration also brings about the eventual death of the flower. Thus the greater the level of respiration, the sooner the flower dies.
【小题4】
How, then, to control the rate at which flowers die? By controlling respiration. How is respiration controlled? By controlling temperature. We know that respiration produces heat, but the reverse is also true. Thus by maintaining low temperatures, respiration is reduced and the cut flower will age more slowly.
【小题5】
Another vital factor in keeping cut flowers is the quality of the water in which they are placed. Flowers find it difficult to “drink” water that is dirty or otherwise polluted. Even when water looks and smells clean, it almost certainly contains harmful substances that can endanger the flowers. To rid the water of these unwanted substances, household chlorine bleach (含氯漂白剂) can be used in small quantities. It is recommended that 15 drops of chlorine bleach(at 4% solution) be added to each litre of water. The water and solution should also be replaced each day.

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。注意:涂卡时,如答题卡上没有E、F、G选项,请按如下方式填涂:选E涂AB;选F涂BC;选G涂CD。
Before going outside in the morning, many of us check a window thermometer (温度计) for the temperature. This helps us decide what to wear.    1    We want our food to be a certain coldness in the refrigerator. We want it a certain hotness in the oven. If we don’t feel well, we use a thermometer to see if we have a fever. We keep our rooms a certain warmth in the winter and a certain coolness in the summer.
Not all the thermometers use the same system to measure temperature. We use a system called the Fahrenheit scale. But most other countries use the Centigrade scale.
Both systems use the freezing and boiling points of water as their guide.     2    
The most common kind of thermometer is made with mercury (水银) inside a clear glass tube. As mercury ( or any other liquid ) becomes hot, it expands. As it gets colder, it contracts (收缩) . That is why on hot days the mercury line is high in the glass tube.     3       
First, take a clear glass juice bottle that has a cap; fill the bottle with colored water. Tap a hole in the center of the cap using a hammer and thick nail. Put the cap on the jar. Then stick a plastic straw (吸管) through the nail hole.
     4    
Finally, place a white card on the outside of the bottle and behind the straw. Now you can see the water level easily.
     5     
As the temperature goes down, the water will contract, and the level in the straw will come down. Perhaps you will want to keep a record of the water level in the straw each morning for a week.
A.      We use and depend on thermometers to measure the temperature of many other things in our daily lives.
B.      Thermometers measure temperature, by using materials that change in the same way when they are heated or cooled.
C.      Now that you know this rule you can make a thermometer of your own that will work.
D.      The water will rise in the straw. As the temperature of the air goes up, the water will expand and rise even higher.
E.      They label these in different ways. On the Fahrenheit scale water freezes at 32 degrees and boils at 212 degrees. On the Celsius scale water freezes at 0 degrees and boils at 100 degrees.
F.      Take wax ( you may use an old candle if you have one ) and melt some of it right where the straw is stuck into the cap to seal them together. 
G.      People use thermometers which are made by themselves when travelling around the world.

阅读下列应用文及相关信息,并按照要求匹配信息。请在答题卡上将对应题号的相应选项字母涂黑。(如果【【答案】】是E请同时涂黑AB, 如果【【答案】】是F请同时涂黑CD),
首先,请阅读下列调查问卷:
A
Dear Sir/Madame
I think robots can do such dangerous jobs as skyscraper builders, bridge builders and so on .If injured or broken, they can be fixed easily. They can also work in unfavorable conditions such as in the dark, extreme heat, extreme  cold, etc.
B
Dear Sir/Madame
I suppose small man—controlled robots could be used as sea rescuing workers to look for people in the sea. When defusing (拆除引信) bombs, robots could also be used to reduce the risk of losing a human life.
C
Dear Sir/Madame
I suppose robots could be used as dustmen during night time, as they don’t need to sleep and they are safe in polluted environment.
D
Dear Sir/Madame
I suppose robots could be used as chemical researchers. At least they can help us keep away from harmful materials or help to go into small areas which are hard to reach for us. It can be used to examine the inside of a nuclear reactor (核反应堆).
E
Dear Sir/Madame
I suppose robots could be astronauts and they could travel very far away,like Pluto.If so,we don’t need to train human beings to be astronauts as it costs quite a lot and it also takes many years to make a professional astronaut.
F
Dear Sir/Madame
I suppose robots could be used as car assembly (装配) workers ,in parts of the production line. Robots can make the process move faster, get more work done and cost less.
请阅读下列答卷人的信息,然后匹配答卷人和他们所提供的调查问卷。
46.Jaime is a professor in the field of biochemistry (生物化学).He is worried about his health situation as he keeps so close to harmful elements year in and year out.
47.Bradley works in the International Security Association.He is sad to think of the fact that there were so many people who couldn’t be saved or found at last in disasters such as in lakes,rivers,seas and so on.
48.Carrie is a young man who has a job in construction company in the city.He is afraid of climbing up laders and carrying the iron bars and other things onto higher places.So he wants to give up the job and find a better one.
49.Josh is a general manager of the National Bluebird Bureau,which is short of excellent astronauts.He has spent lots of his time and money on training them.
50.Alan,who is in his thirties,is a worker in an auto factory.He is thinking of changing his job for shooter which is more interesting and creative.
答卷人在调查问卷中的问答:
46.Jaime                             

A.Skyscraper builders
47.Bradley
B.Sea rescuing workers
48.Carrie
C.Dustmen
49.Josh
D.Chemical researchers
50.Alan                             E.Astronauts
F.Car assembly workers

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网