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
2010-09-10
33
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 does the word "hallucination" mean?
选项
答案
Vision
解析
连词在阅读理解中起着十分重要的作用。巧妙地利用连词,我们对难句的理解会变得更轻松;有时这些“不起眼”的词甚至在理解中起决定性作用,达到事半功倍的效果。连接词在英语中也称作“signal words”(提醒词),单从称谓上就可看出其作用是不可低估的。
转载请注明原文地址:https://kaotiyun.com/show/XU87777K
0
大学英语四级
相关试题推荐
A、Girlsusuallyplayinlargegroups.B、Girlsliketobrag.C、Girlsdon’toftengiveorders;theygivesuggestions.D、Girlssay
Withmoreandmoreparentsworkingoutsidethehome,studentsareveryawarethatitisdifficultforschoolofficialstocontac
Withmoreandmoreparentsworkingoutsidethehome,studentsareveryawarethatitisdifficultforschoolofficialstocontac
Manyayoungpersonstellsmehewantstobeawriter.【M1】______Ialwaysencouragesuchpeople,butIalsoexpla
Manyayoungpersonstellsmehewantstobeawriter.【M1】______Ialwaysencouragesuchpeople,butIalsoexpla
A、Apersonneedstogobackhomefrequently.B、Apersonneedsadjustmentinanewenvironment.C、Apersonneedstoexperienceso
A、Workingwomenwhohavenotimeforcooking.B、Husbandsandchildrenofworkingwomen.C、Workingwomenwhomusttravelontheir
A、Tofindaworkerandfollowhimclosely.B、Tofindapersonyouadmireandmakefriendswithhim.C、Tofindapersonyourespe
随机试题
A.肥达试验B.抗O试验C.结核菌素试验D.锡克试验E.神奈川试验风湿热的辅助诊断试验是()
蜗杆传动机构的装配顺序应根据具体情况而定,一般应先装()。
医疗机构内被传染病病原体污染的场所、物品患甲类传染病、炭疽死亡的,应将尸体
纯浆液性腺泡的大唾液腺小唾液腺,纯粘液腺
女性的肺癌大多是食管癌大多是
(2001年考试真题)下列各科目的余额,期末应结转到“本年利润”科目的有()。
精神病人陈某发病上街打砸,严重危害他人人身安全,公安民警可以对其()。
2014年规模以上电子信息制造业实现利税总额:
某乡镇民政办公室主任万某利用其掌握的乡镇户籍低保资格复核权,收受申请人好处费,被上级机关撤销主任一职。万某受到的法律制裁属于()
Inhiscompositiontherewere___________________________(除了少许拼写错误以外没有其他错误).
最新回复
(
0
)