This may be because some people do not have the genes necessary to generate particular smell receptors in the nose.These receptors are the cells which sense smells and send（ ）to the brain.A.signsB.stimuliC.messagesD.impulses
This may be because some people do not have the genes necessary to generate particular smell receptors in the nose.These receptors are the cells which sense smells and send（ ）to the brain.
A.signs
B.stimuli
C.messages
D.impulses
B.stimuli
C.messages
D.impulses
参考解析
解析：本句描述的是构成气味接受器的细胞的活动，由常识可知，这些细胞感知到气味以后，就会向大脑传递所获得的信息。而在各选项中，能正确表达这一概念的只有C.message一词。因此，本词的正确选项是[C]。
相关考题：
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共用题干第一篇The Smell of MoneyFor many years large supermarkets have been encouraging us to spend money by pumping the smell of freshly-baked bread into their stores. Now Dale Air, a leading firm of aroma（香气）consultants, has been approached by Barclay's Bank to develop suitable artificial smells for their banks.Researchers have suggested that surrounding customers with the"smell of money"will encourage them to feel relaxed and optimistic and give them added confidence in the bank's security and professionalism.But before a smell can be manufactured and introduced into banks' air conditioning systems,it must be identified and chemically analyzed,and this has proved to be difficult.The problem is that banknotes and coins tend to pick up the smell of their surroundings.So cash that has been sitting in a cash register at a fishmonger's（鱼贩）will smell of fish,and banknotes used to pay for meals in restaurants will tend to smellof food.It may be a challenge,but aroma experts have little doubt that the use of artificial smells can be an effective form of subconscious advertising. Lunn Poly,a British travel company,introduced the smell of coconuts（椰 子）into its travel agencies and saw a big increase in spending by holiday makers.Many cafs now have elec-tric dispensers（自动售货机）that release the smell of freshly roasted coffee near their entrances, subtly encouraging customers to come in and have a drink or snack. Even prestigious car maker Rolls-Royce has been spraying the inside of its cars to enhance the smell of the leather seats."The sense of smell is probably the most basic and primitive of all human senses,"explains researcher Jim O'Riordan. "There is a direct pathway from the olfactory（嗅觉的）organs in the nose to the brain."It is certainly true that most people find certain smells incredibly strong,stirring memories and feelings in a way that few other stimulants（刺激物）can rival. It is a phenomenon marketing consultants have long recog- nized,but until recently have been unable to harness."We've made great progress but the technology of odour production is still in its infancy,"says O'Riordan."Who knows where it will take us."Artificial smells have NOT been used inA:cafesB:banksC:travel agenciesD:supermarkets
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共用题干Parkinson's Disease1 Parkinson's disease affects the way you move.It happens when there is a problem with certain nerve cells in the brain. Normally , these nerve cells make an important chemical called dopamine（多巴胺）. Dopamine sends signals to the part of your brain that controls movement.It lets your muscles move smoothly and do what you want them to do.When you have Parkinson's,these nerve cells break down.Then you nolonger have enough dopamine,and you have trouble moving the way you want to.2 No one knows for sure what makes these nerve cells break down.But scientists are doing a lot of research to look for the answer. They are studying many possible causes,including aging and poisons in the environment.Abnormal genes seem to lead to Parkinson's disease in some people.But so far,there is not enough proof to show that it is always inherited.3 Tremor（颤抖）may be the first symptom you notice.It is one of the most common signs of the disease,although not everyone has it.Tremor often starts in just one arm or leg or only on one side of the body.It may be worse when you are awake but not moving the affected arm or leg.It may get better when you move the limb or when you are asleep.In time,Parkinson's affects muscles all through your body,so it can lead to problems like trouble swallowing or constipation（便秘）.In the later stages of the disease,a person with Parkinson's may have a fixed or blank expression,trouble" speaking,and other problems.Some people also have a decrease in mental skills.4 At this time,there is no cure for Parkinson's disease.But there are several types of medicines that can control the symptoms and make the disease easier to live with.You may not even need treatment if your symptoms are mild.Your doctor may wait to prescribe medicines until your symptoms start to get in the way of your daily life.Your doctor will adjust your medicines as your symptoms get worse.You may need to take several medicines to get the best results.One of the most common signs of Parkinson's is tremor,__________.A:what affects muscles all through your bodyB:if there isn't enough dopamine in your bodyC:which cannot be cured yetD:which may be the first symptom you noticeE:if you have a fixed or blank expression F: what causes Parkinson's disease
共用题干AgingThroughout history man has had to accept the fact that all living things must die,but people now live longer than they used to.Yet all living things still show the________(51)of aging,which will eventually________(52)death.Aging is not a disease,but as a person passes maturity,the cells of the body and the________ (53) do not function as well as they did in childhood and adolescence（青春期）.The body provides less________(54)against disease and is more likely________(55)have accident.A number of related causes may________(56)aging. Some cells of the body have a fairly long life,but they are not reborn when they die.As a person ages,________(57)of brain cells and muscle cells decreases.The other cells are replaced by new cells.In an aging person the________(58) cells and muscle cells may not be as viable（能生存的）or as capable________ ( 59 ) growth as those of a young person.Another________(60)in aging may be changes within the cells themselves.Some of the protein chemicals in cells are known________(61)with age and became less elastic.This is why the skin of old people wrinkles and________(62).This is also the reason old people________(63)in height. There may not be other more important chemical changes in the cells.Some complex cell chemicals, such as DNA and RNA,store and________(64)information that the cells need.Aging may affect this________(65)and change the information-carry molecules so that they do not transmit the information as well._________(51)A:function B:effectC:fact D:symbol
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单选题Some people are often surprised by what other people do. According to Berger, that is mainly because _____.Asome people are more emotional than othersBsome people are not aware of the fact that we will never completely know another personCsome people are sensitive enough to sense the change of other people’s attitudesDsome people choose to keep to themselves
问答题Practice 7 Some people would say that the Englishman's home is no longer his castle; that it has become his workshop. This is partly because the average English is keen on working with his own hands and partly because he feels, for one reason or another, that he must do for himself many household jobs for which, some years ago, he would have hired professional help. The main reason for this is a financial one.. the high cost of labor has meant that the builders and decorators' costs have reached a level which makes them prohibitive for house-proud English people of modest means. So, if they wish to keep their houses looking bright and smart, they have to tackle some of the repairs and decorating themselves. As a result, there has grown up in the post-war years what is sometimes referred to as the “Do-it-yourself Movement”. The “Do-it-yourself Movement” began with home decorating but has since spread into a much wider field. Nowadays there seem to be very few things that cannot be made by the “do-it- yourself” method.
单选题There will be ______ jobs for people because some robots will do the same jobs as people.AmanyBmoreCfewerDfewest