首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Drugs can be divided into three main groups: those that a person can buy without a prescription. those that a person needs a doc
Drugs can be divided into three main groups: those that a person can buy without a prescription. those that a person needs a doc
admin
2010-07-24
13
问题
Drugs can be divided into three main groups: those that a person can buy without a prescription. those that a person needs a doctor’s prescription for, and those that are illegal.
Two popular nonprescription drugs are caffeine (咖啡因) and alcohol. Caffeine is found in coffee, tea, chocolate, and cola drinks. It is a mental stimulant; it stimulates the central nervous system and makes people feel alert. Students, for example, often find they can study better if they have a cup of coffee. On the other hand, caffeine can also make people nervous and irritable. If people drink too much caffeine, they may have trouble sleeping.
Alcohol is a depressant; it depresses the central nervous system. When people drink, they have less control over their actions. They cannot walk in a straight line and they cannot drive as well as when they are alcohol-free in their blood. People who drink a great deal sometimes fall into a deep sleep. Later, they may wake up with a strong headache.
In addition to these nonprescription drugs, there are two major categories of prescription drugs : stimulants and depressants. The depressants include morphine(吗啡), which is used as a pain killer. The most common stimulants are amphetamines (苯丙胺). Doctors used to prescribe amphetamines as diet pills ; however, they found that amphetamines can have serious side effects. They can make a patient very nervous, and when the drug wears off, the patient may feel very depressed. Doctors still give amphetamines to people with narcolepsy, an illness that causes sudden, uncontrollable attacks of sleep.
The largest class of illegal drugs are hallucinogens, drugs that .change the way a person thinks and cause hallucinations, or visions. For some people, marijuana(大麻) is a mild hallucinogen. Marijuana generally brings a pleasant feeling. However, when people smoke marijuana, they sometimes can not concentrate very well on their activities, such as their work or driving.
What is the meaning of "alcohol-free" ?
选项
答案
Without alcohol or no alcohol
解析
就文章词或短语的词义提问,我们在前面已经见过。做这类题需要分两个步骤:首先确定词义,从生词前后,甚至整段中归纳出答案来。其次,正确地解释词义。解释词义往往比确定词义要困难。因为不少考生对词义的理解往往是心里明白,但说不出来,或者说不能用精练的语言说出来。根据第三段内容可找出答案。
转载请注明原文地址:https://kaotiyun.com/show/n0N7777K
0
大学英语四级
相关试题推荐
Themainreasonfordevelopingabettervocabularyistoreceiveandsendoutthoughtsbetter.Notjustwords—butideasthatwo
A、HewantedtofightagainsttheAmericans.B、HewantedtovisitGeorgeWashington.C、HewantedtodobusinesswiththeAmerican
Learningcouldnotoccurwithoutthefunctionpopularlynamedmemory.So-calledintelligentbehaviourdemandsmemory,rememberin
Internetvotinghappensallthetime,butusuallyit’sconfinedtotopicssuchas"WhoisthecutestcastmemberofPartyofFiv
A、Threegroupsoflearners.B、TheimportanceofbusinessEnglish.C、FeaturesofEnglishfordifferentpapacies.D、EnglishforSp
Themanyenthusiasticusersofe-mailfinditaveryuseful【S1】______forconductingbusinessandforsocializingfastand【S2】__
PabloRuizPicassowasaSpanishpainter,【B1】______andengraverwholivedfrom1881to1973.Hewasavery【B2】______(independent
A、Becausetheyarewell-madeandthestoriesareinteresting.B、Becausetheheroeshavetocopewithmanyproblemsandfrustrati
A、Helpingafriendfindtherightdepartment.B、Buyinghimselfsomeshoes.C、Takingaclassatthegymnasium.D、Returningajogg
Ofthemanydiscouragingaspectsofcomputersecurity,oneoftheworstisthatoffendersarerarelypunishedatall,letalone
随机试题
某企业采用先进先出法计算发出甲材料的成本,2007年2月1日,结存甲材料200千克,每千克实际成本100元;2月10日购入甲材料千克,每千克实际成本110元;2月15日发出甲材料400千克。2月末,库存甲材料的实际成本为()元。
生物利用度是指药物
A.栓剂B.合剂C.糖浆剂D.胶囊剂E.露剂
【案情】甲公司职工黎某因公司拖欠其工资,多次与公司法定代表人王某发生争吵,王某一怒之下打了黎某耳光。为报复王某,黎某找到江甲的儿子江乙(17岁),唆使江乙将王某办公室的电脑、投影仪等设备砸坏,承诺事成之后给其一台数码相机为报酬。事后,甲公司对王某
甲因为随身携带的票据在乘车时遗失,向有管辖权的人民法院申请公示催告,法院受理后依法发出公告,在公示催告期间乙向法院申报。法院的下列做法中错误的是:()
已知:MT公司2014年年初所有者权益总额为1500万元,该年的资本保值增值率为125%。2016年年初负债总额为4000万元,所有者权益是负债的1.5倍,该年的资本积累率为150%,年末资产负债率为25%,负债的年均利率为10%,全年固定成本总额为975
国民经济发展的总体目标一般包括()。
2015年政府工作报告中指出,我国经济发展进入新常态,正处在爬坡过坎的关口,其“拦路虎”是()。
斯伯林(Sperling)使用局部报告法得以证明存在的记忆类型是
若TMS320C6000的流水线深度达到8级时,则器件可同时运行______条指令。
最新回复
(
0
)