【正文】 y, one hundred cents door n. an opening for entering or leaving a building or room down ad. from higher to lower。 in a low place dream v. to have a picture or story in the mind during sleep。 n. a picture or story in the mind during sleep。 a happy idea about the future drink v. to take liquid into the body through the mouth drive v. to control a moving vehicle drop v. to fall or let fall。 to go lower drown v. to die under water drug n. anything used as a medicine or in making medicine。 a chemical substance used to ease pain or to affect the mind dry ad. not wet。 without rain during ad. through the whole time。 while (something is happening) dust n. pieces of matter so small that they can float in the air duty n. one’s job or responsibility。 what one must do because it is right and just Eeach ad. every one by itself early ad. at or near the beginning, especially the beginning of the day。 opposite late earn v. to be paid in return for work done earth n. the planet we all live on。 the ground or soil earthquake n. a sudden, violent shaking of the earth’s surface ease v. to reduce。 to make less difficult east n. the direction from which the sun rises easy ad. not difficult。 not hard to do eat v. to take food into the body through the mouth ecology n. the scientific study of the environment and links among living and material things economy n. the system by which money, industry and trade are organized edge n. the line where something ends or begins education n. the act of teaching effect n. the result or change caused by something (The storm had a serious effect on the economy.) effort n. an attempt。 the work necessary to do something egg n. the rounded object containing unborn young produced by female birds, fish or reptiles。 a single cell in a female person or animal that can develop into a baby either ad. one of two, but not the other elect v. to choose by voting electricity n. a form of energy that flows through wires to provide heat and light, and power to machines embassy n. the offices of an ambassador and his or her assistants emergency n. an unexpected and dangerous situation demanding quick action emotion n. a strong feeling such as love, hate, fear or sadness employ v. to give work in return for wages empty ad. having nothing inside。 v. to remove everything end v. to stop。 to finish。 n. the part which es last enemy n. a person opposing or hating another。 a person or people of the other side in a war energy n. power used to do work, usually with machines。 the ability and willingness to be active enforce v. to make something be done engine n. a machine that uses energy to cause movement or to do work engineer n. a person who designs engines, machines, roads, bridges or railroads enjoy v. to be pleased or satisfied by something enough ad. as much as necessary。 pro. the amount needed enter v. to e or go into environment n. all surrounding things, conditions and influences that affect life。 the natural world of land, sea, air, plants and animals equal ad. the same in amount, size, weight or value。 having the same rights equipment n. things, tools or machines needed for a purpose or activity escape v. to get free。 to get away from。 to get out of especially ad. more than others (We liked the food, especially the fish.) establish v. to bring into existence。 to create estimate v. to form an opinion about a value, size or amount using less than plete information ethnic ad. of or concerning people belonging to a large group because of their race, religion, language, tribe or where their ancestors lived evaporate v. to change from a liquid into a gas even ad. in a way not thought possible (They survived, even though the building was destroyed.) event n. that which happens, especially something of importance ever ad. at any time every ad. each one。 all evidence n. material or facts that prove something。 a reason for believing evil ad. not good。 extremely bad exact ad. having no mistakes。 correct in every detail examine v. to study closely example n. a part that shows what the rest of a thing or group is like excellent ad. extremely good except prep. but for exchange v. to trade。 to give or receive one thing for another excuse v. to take away blame。 to pardon。 to forgive。 n. a reason (sometimes false) for an action execute v. to kill exercise n. an activity or effort for the purpose of improving the body or to stay in good health exile v. to force a person to leave his or her country。 to expel。 n. a person who is forced to leave his or her country exist v. to be。 to live expand v. to make larger。 to grow larger expect v. to think or believe that something will happen。 to wait for an event expel v. to force out。 to remove from。 to send away experience v. to live through an event, situation or condition (She experienced great pain.)。 n. something that one has done or lived through (The experience caused her great pain.) experiment v. to test。 n. a test or trial carried out to prove if an idea is true or false, or to discover something expert n. a person with special knowledge or training explain v. to give reasons for。 to make clear。 to tell about。 to tell the meaning explode v. to break apart violently with a loud noise, like a bomb explore v. to travel in a place that is not well known to learn more about it。 to make a careful search。 to examine closely export v. to send to another country。 n. something sent to another country, usually for sale express v. to say clearly extend v. to stretch out in area or length。 to continue for a longer time extra ad. more than normal, expected or necessary extreme ad. more than the usual or accepted extre