大学基础1500 words.doc

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(1)The President commands all the military forces. (2)comment(1) to say something about; (2) to express an opinion about somethingcommitteecommoncommunicatecommunitycompanycomparecompetecompletecomplexcompromisecomputerconcerncondemncondition conferenceconfirmconflictcongratulateCongressconnectconservativeconsiderconstitutioncontaincontainercontinentcontinuecontrolconventioncookcoolcooperatecopycorncorrectcostcottoncountcountrycourtcovercowcrashcreatecreaturecreditcrewcrimecriminalcrisiscriticizecropscrosscrowdcrushcryculturecurecurfewcurrentcustomcustomscutdamdamagedancedangerdarkdatedaughterdaydeaddeafdealdebatedebtdecidedeclaredecreasedeepdefeatdefenddeficitdefinedegreedelaydelegatedemanddemocracydemonstratedenouncedenydependdeploredeploydepressiondescribedesertdesigndesiredestroydetaildevelopdevicedictatordiedietdifferentdifficultdigdinnerdiplomatdirect 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insweetswimsympathysystemtaketalktalltanktargettastetaxteateachteamteartearstechnicaltechnologytelephonetelltemperaturetemporarytensetermterribleterritoryterrorterroristtestthanthankthatthetheaterthemthentheorytherethesetheythickthinthingthinkthirdthisthreatenthroughthrowtietimetiredtotodaytogethertomorrowtonighttootooltoptorturetotaltouchtowardtowntradetraditiontraffictragictraintransporttransportationtraptraveltreasontreasuretreattreatmenttreatytreetrialtribetricktriptroopstroubletrucetrucktruetrusttrytubeturnunderunderstanduniteuniverseuniversityunlessuntilupurgeurgentususeusualvalleyvaluevegetablevehicleversionveryvetoviciousvictimvictoryvillageviolateviolencevisitvoicevolcanovotewageswait walkwallwantwar warm warn wash waste watch water wave waywe weak wealth weaponwear weather weekweigh welcome wellwestwet what wheatwheelwhen where whichwhilewhite who wholewhywide wife wild will willing win wind windowwinter wire wise wish with withdraw withoutwoman wonder wonderfulwood word work world worry worseworth woundwreckwreckagewrite wrong yearyellow yes yesterday yetyou youngzoo(COMMON EXPRESSIONS)a lot of much or manyWe had a lot of rain.carry out to do; to put into effectPlease carry out the plan.pass a bill approveCongress is expected to pass a bill to cut taxes.take steps to start to do somethingThe government will take steps to halt inflation.(WORDS USED IN VOA SPECIAL ENGLISH SCIENCE PROGRAMS) antibodies special proteins, produced in the blood, that kill harmful bacteriaThe bodys defense system creates different antibodies for each disease it fights.atom a very small part of all things; the smallest part of an element that can join with parts of other elementsAll matter is made of atoms.bacteria living things that are one cell and can be seen only through a microscope; some cause diseaseSome bacteria cause disease.cell a small mass of living material that is part of all plants and animalsAll plants and animals are made of cells.chromosome a line of genes; most human cells contain 46 chromosomesChromosomes carry the genes that make each of us different. compound a substance containing two or more elementsA compound contains two or more chemical elements.dense close together; thickLead is a dense material.electron a small part of an atom that has an electrical forceAn electron is a small part of an atom.element one of more than 100 substances known to science that cannot be separated into other substancesAn element cannot be separated into other substances.enzyme a special kind of protein; it produces changes in other substances without being changed itselfAn enzyme can change other substances without being changed itself.fetus unborn youngA human embryo becomes a fetus after eight weeks.fission a splitting; in atomic fission, the nucleus of an atom is split to produce nuclear energyNuclear fission splits atoms to produce energy.fusion a joining together; in atomic fusion, atomic particles are joined together to produce nuclear energyNuclear fusion joins atoms to produce energy.genes parts of cells that control the growth and development of living things; genes from the mother and father are passed to the child; genes contain nucleic acidGenes in the cell control the growth and development of living things.genetic engineering the science of changing the genes of a living thingGenetic engineering changes the genes of a living organism.gravity the force that pulls things toward the centerGravity is the force that pulls things toward the center.image a reproduction of the appearance of a person or thingAn image is a picture of someone or something.laser an instrument that makes a thin, powerful lightA laser makes a thin, powerful beam of light.magnet a piece of iron or other material that has a pulling force; this pulling force is called magnetismA magnet pulls on objects of iron or steel.molecule the smallest amount of a chemical substance that can existA molecule is the smallest part of a chemical substance. nerve a thin piece of tissue that sends information through the body to and from the brainNerves carry information between the brain and the other parts of the body. nucleic acid a molecule that holds the genetic information necessary for life; there are two kinds of nucleic acid: DNA (deoxyribonucleic acid) and RNA (ribonucleic acid)A molecule of nucleic acid holds the genetic information necessary for life.nucleus the center part of an atom or cellThe nucleus is the center part of an atom or cell.nutrient a food or substance that makes plants, humans or animals growFood is a nutrient that makes humans and animals an a part of the body that has a special purpose, such as the heart or brainThe heart and the brain are anism a living thing, often so small it can be seen only through a microscopeAn organism is a living plant or animal of any size.particle a very small piece of matterA particle is a very small piece of teins substances responsible for the growth of tissue and for fixing damaged tissueProteins fix damaged tissue and help tissue grow.robot a machine that moves and performs tasksA robot is a machine that moves and does work.tissue living material; a group of cells that are similar in appearance and do the same thingTissue is a group of living cells. virus a kind of organism that causes diseaseA virus is a tiny organism that invades cells and causes disease.x-rays a kind of radiation that can pass through most solid materials, often used in medicineX-ray radiation is used to make images of bones and tissue for medical purposes.(SOME CHEMICAL ELEMENTS)hydrogen: Hhelium: Hecarbon: Cnitrogen: Noxygen: Osodium: Namagnesium: Mgaluminum: Alsilicon: Siphosphorus: Psulfur: Schlorine: Clpotassium: Kcalcium: Catitanium: Tiiron: 鉄Fenickel: Nicopp