大学英语四之大学英语下习题库

1、Unit 1 Animals and PlantsExercisesIConversation：Choose the right answer to finish the following conversations.1 You are confident about the job interview, arent you? Im well prepared and feel Ive got everything they need.AWell, maybe. BIts hard to say. CI hope so. DSure, I am.2 One weeks time has been wasted. I cant believe we did all that work for _.Asomething BnothingCeverything Danything3 Lets go and have a good drink tonight. _ Have you got the first prize in the competition?AWhat for ? BTha

2、nks a lot.CYes, Id like to. DWhy not ?4 Go for a picnic this weekend, OK? _. I love getting close to nature.AI couldnt agree more.BIm afraid not.CI believe not. DI dont think so5 Im terribly sorry to have caused you so much trouble. _.AMy pleasure BI couldCOh, no.DThats nothing IIReading ComprehensionEach of the following two passages is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C, and D. Decide on the best choice.Passage 1Almost ev

3、eryone loves trees, but did you know that trees can help people heal faster? Its true. According to the International Society of Arboriculture, hospital patients have been shown to recover faster when offered a view with trees. And while trees certainly benefit any landscape, they are actually important to our daily well-being. Trees improve the quality of the air around us by absorbing dust and other particulates. Their leaves also take in noxious (有害的) gases, such as carbon dioxide, carbon mon

4、oxide (一氧化物) , and sulfur dioxide (二氧化硫) , before we ever breathe them in. Plus, trees protect us from the effects of the sun and from rain, hail, and snow and produce clean oxygen for us to breathe. If the health of people and the environment are not high on your list of concerns, perhaps your wallet is: Trees make economic sense. A home surrounded by trees costs less to cool and heat. Neighborhoods with trees are often several degrees cooler than those in similar climates that dont have trees.

5、 In winter, trees can keep your house warmer by blocking high winds. Also, less water is needed in tree-shaded areas where the sun isnt constantly beating down on the earth below. Besides, trees can provide more privacy, cover up unpleasant views, and add to the value of your home. Unfortunately, these days, mass construction projects tend to wipe out all the trees in an area before creating new neighborhoods and buildings. Thats why its more important than ever to plant a tree in your community

6、. 1The sights of trees can make a sick person_.Afeel more confidentBlose hopeCget annoyedDheal faster 2Trees can benefit our daily well-being by all the following means EXCEPT_.Aabsorbing harmful gasesBgiving off oxygen Ccuring certain diseases Denabling people to heal faster3By saying that trees make economic sense, the author means _.Atrees help to keep our house at agreeable temperaturesBcutting trees down to produce logs is very profitableCtrees can prevent global warmingDliving in a neighbo

7、rhood with trees extends our life span4The phrase “wipe out” in the fourth paragraph is closest in meaning to _.Aviolently beatBcompletely destroy Ccarefully protectDgreatly reduce5The best title for the passage may be _.AMore trees, More OxygenBTrees and HealthCHow to Save the Trees in DangerDPlant a Tree in Your CommunityPassage 2 How Animals ThinkScrub jays can trick you, researchers say. Monkeys kick themselves for mistakes in judgment. And at least one parrot figured out something close to

8、the mathematical concept of zero. Animals can be very devoted, as a number of stories have proved. Whats less obvious is how smart they are. In study after study over the past decade, theyve shown abilities previously thought to exist only in humans. Take the scrub jays as an example. A few years ago, Cambridge University professor Nicky Clayton, PhD, found that these birds can be surprisingly shrewd, remembering not only what foods theyve hidden but where, how long ago, and whether anyone else

9、might have noticed. “If another bird was watching, theyd wait until that bird was gone and then move the food,” Clayton says. Even more interesting, not all jays protected their food that wayonly those that had previously attacked other birds stores. “It takes a thief to know a thief.” says Clayton.But perhaps no animal has done more to overthrow conventional ideas than Alex, an African gray parrot. Alex challenged the belief that parrots could simple imitate mans words or actions. He was constantly being tested; when he was tired of it, he would tell Pepperberg, “Wanna go back”to his cage. If the request annoyed her, Alex would say, “Sorry.” The parrot toyed with her for some t

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