【导语】本文是一篇说明文。文章介绍了布朗大学的多夫·萨克斯最近发表的一项研究提出了一个问题，即如何更好地评估引进物种的好处，从而使意见更加全面。并建议在未来的研究中应该对物种的引入所带来的影响和改变进行全面的评估而非局限性的研究。
C
Introduced species have a bad reputation. It has been believed that the species mix in a particular place should remain as unchanged as possible. But this is just an opinion. Other opinions are possible. A study published recently by Dov Sax of Brown University，thus asks how the benefits of introduced species might be better assessed，so that opinions can be more informed. Specifically，he identifies several aspects for that.
Initially，whether introduced species provide direct human advantage is taken into account. Dr. Sax and his colleagues ignored crops，since their benefits are obvious. But they included transplanted grass species that have gone wild，yet provide grazing(牧草)for domestic animals，and introduced forest trees that produce wood for construction.
Another factor is their possible benefit to the ecosystem into which the introduction has happened. Such introduction is sometimes made to reduce the risk of a localised species becoming extinct. Pyne’s ground plum(李子)，native to a handful of sites in the central basins of Tennessee but now transplanted to others，九上英语阅读题及答案，falls into this category.，
Another factor is their possible benefit to the ecosystem into which the introduction has happened. Such introduction is sometimes made to reduce the risk of a localised species becoming extinct. Pyne’s ground plum(李子)，native to a handful of sites in the central basins of Tennessee but now transplanted to others，falls into this category.
51 C 依据：Many of us may feel “burnout” at times in our lives. It can be prevented, however, if you take action before you are in danger.52. B 53. D 依据：Third，make sure you have time off．。
The last value is experienced on an emotional rather than a practical level. Lots of people feel good about native wildlife，which is generally the main motive for its conservation. But that feel-good factor can extend to introduced species as well. Such value can cut both ways，however. For example，ring-necked parakeets，an Asian and African species，have been spreading through Britain for several decades. Some find them a colourful addition to the local wildlife，others a noisy competitor for native birds.
答案在第二自然段的第二个句子。 3.B。同第二题一样,此题也是细节题。可在第二自然段直接找到答案。 4.A。单句理解题。最后一个自然段中有说:In Europe it is quite usual to cross your legs When you are sitting talking 。
In light of their analysis，Dr. Sax and his team therefore suggest that researchers studying introduced species should in future create a clear distinction in their studies between changes that have happened and judgments about the value of those changes. In addition，when making those judgments，they should acknowledge all types of values，rather than focusing narrowly on one or two of them.
下面我给大家带来了九年级的英语阅读理解题以及答案，有需要的朋友可以阅读学习一下哦!第一篇： In England, people often talk about the weather because they can experience (经历) four seasons in one day. In t。
8. What is Dr. Sax’s study aimed to do?
A. Kecp track of introduced species.
B. Get introduced species fully understood.
C. Compare opinions on introduced species.
D. Identify consequences of introducing species.
A. To provide graze for local animals.
B. To produce wood for construction.
C. To build a new local ecosystem.
D To save local species from dying out.
A. They don’t care about it.
Return Time: 4:30 p.m. 九年级上册英语单元测试题答案 一、 1--5 BCBAD 6--10 CBAAC 11--15 DCADD 二、 16--20 BDACA 21--25 CBDCD 三、 (A) 26--30 DCBAB (B) 31 farmer; hungry; rainy 32. farm work 。
B. They consider it acceptable.
C. They can’t put up with it.
D. They hold divided opinions on it.
1.An English traveler found himself in Norway with only enough money to buy the ticket for his journey back home.及So he bought a ticket and got on the ship. 故选A 2. he decided that he could easily。
11. What does Dr. Sax suggest to the future researchers?
A. Focusing on main values.
B. Evaluating evident changes.
C. Analyzing previous researches.
D. Presenting all-round assessments.
B
D
D
D
