在生态平衡的状态中，生物有生有死，有迁进也有迁出，每个物种的数量经常处在一个动态变化之中。[]-八年级生物

更多内容推荐

• The traditional approach __________ with complex problems is to break them down into smaller，more ea
• You are _________ to have such a good teacher.A．fortuneB．fortunateC．fortunatelyD．unfortunately-高一英语
• Don't leave matches or cigarettes on the table within the _____ of little children.A．handB．reac
• 下列属于生产者和消费者之间的关系的是[]A．青蛙捕昆虫B．猫头鹰捉田鼠C．蝗虫吃庄稼D．麻雀吃虫子-八年级生物
• 许多动物都成了人类的盘中餐，有的人吃腻了平时常吃的动物，又把目光瞄准了野生动物，认为野味更有营养，更好吃。一些饭店也迎合这些人的口味，推出了一些野味菜肴，不少野生-八年级生物
• Next week there will be a basketball match between the ________ and the ________of our school. A．wom
• The________of life is being________ what I am or what I have.A．pride；proudB．pride in；proud ofC．pride
• As a result of the destruction of the forest, a large ________ of animals ________ lost their living
• The poor man made a_____after doing business forthree years.A．treasureB．pleasureC．moneyD．fortune-高三英
• Working hard is not only a _____ of great success, but it is among the essential requirement.A．sign
• In the _____ of proof, who is the thief is still not announced.A．presence B．absence C．direction D．fa
• ______ came that he and his girlfriend had broken up just because he didn’t keep his ______ again.A
• The people from the south enjoy the________in the north during the winter because they have never se
• 我国河北省北部地区，在麦收时节，据统计，每公顷麦田约有750~1500只青蛙，一只青蛙一天可食20~200只害虫。因此，依靠这种天然的“除虫剂”，基本上可以控制害虫，保证小麦的收-八年级生物
• The short-answer test is a kind of____between the composition and selection types.A．mixtureB．collect
• 为了防止鸟吃草籽，有人把人工种草的实验区用网子罩起来。过一段时间发现，实验区里草的叶子几乎都被虫吃光了，而未加罩网的天然草场，草反而生长良好。造成这一后果的主要原-八年级生物
• As we all know，life is a long________full of happiness as well as hardships.A．journeyB．tripC．travelD
• There is a(n) ________ of peace and calm in the country, quite different from that of a big city.A．
• 家鼠是同学们熟悉的动物，下列对于家鼠的认识不正确的是[]A．家鼠在食物链或食物网中占据一环，过多过少对生态系统都会产生不良影响B．家鼠在帮助植物传播果实和种子方面有一定-八年级生物
• Bill was doing a lot of physical exercise to build up his_________.A．energyB．forceC．strengthD．power
• British students only have a language ____ for jobs in the USA and Australia.A．chanceB．abilityC．poss
• 在“玉米→蝗虫→蛇”食物链中，如果人们大量捕食蛇，其后果是：蝗虫________，玉米。-八年级生物
• When I was a little boy，I lived in a small fishing village.The visit to the village made me think of
• Some cyclists make the ______ that traffic laws do not ______ them. It is not true, _____.A．assumpti
• 在生态系统中，绝大部分动物属于[]A．生产者B．消费者C．分解者D．非生物的成分-八年级生物
• 草原上野兔的数量上升的主要原因可能是[]A．草太多B．兔的天敌减少C．兔的繁殖力强D．兔的天敌增多-八年级生物
• As we know, too much ________ to Xrays can cause skin burns, cancer or other damage to the body.A．c
• The manager of the company told us that very little ________ was made of the waste material in the p
• At the meeting they discussed three different __________ to the study of mathematics.A．approaches B．
• Many countries are increasing their use of natural gas, wind and other forms of ____.A．energyB．sourc
• The soldiers have to stand for hours without changing.A．positionB．situationC．locationD．condition-高一英
• I can't say which wine is better—it's a(n)________of personal taste. A．matterB．affairC．eve
• —Was the proposal passed at yesterday’s meeting?—Yes, but some members of the committee expressed __
• The CCTV show Chinese Characters Dictation Competition has taken the country by storm, which is par
• —Hi, Mike! We’re going biking along the beach this weekend.—_______. I love being bathed in the suns
• —Can you help me with this problem?—It's beyond my __________.I didn't work it out, either
• --- Can you shoot that bird at the top of the tree?--- No, it's out of ____.A．rangeB．reachC．con
• I am sure David will be able to find the library - he has a pretty good ____ of direction.A．ideaB．fe
• After a long day of hard work, my onlyis to get back home and have a good sleep. A．concernB．ambition
• 只要是对人类有害的动物，都应消灭。[]-八年级生物
• 在果园里放养蜜蜂，由于蜜蜂采食果树花粉，会致使结果率下降。[]-八年级生物
• There are many people who have alike yours, but they don’t believe they have the power to do anythin
• ．Hundreds of people gave their lives in __________ of freedom.A．protectionB．guardC．defenceD．favor-英语
• Tom’s little sister is a girl of great _______. She takes an interest in everything.A．ambitionB．caut
• Besides proper diet, exercise is one of the key ___________of a healthy lifestyle.A．componentsB．cate
• The dentist gave me a shot which took ________ almost immediately and I didn't feel a thing.A．o
• The song Take Me Home, Country Roads has muchto people, for few people can avoid getting caught up i
• Many countries are increasing their use of natural gas, wind and other forms of ______.A．energyB．pow
• At times, worrying is a normal________ to a difficult event or situation—a loved one being_______ in
• Beijing Man used fire for cooking food and also for light, warmth and ________ wild beasts.A．protect