问题 问答题 简答题

解剖及生理学特点

答案

参考答案:

1、下颌骨喙状突较小,髁状突发达,形态有品系特征,遗传力较高。上下颌各有两个门齿和六个臼齿。

2、无汗腺,体温调节不稳定,背腹面各有一条静脉,两侧各有一条动脉。尾有散热、平衡、自卫等功能。

3、食道细长,约为2cm;胃容量小(1.0—1.5ml);小鼠没有腭或咽扁桃体,无呕吐反应:肠道较短,盲肠不发达,肠内能合成维生素C。肝脏分左、右、中、尾四叶组成。有胆囊;雄鼠脾脏明显比雌鼠大,胰腺分散在十二指肠,胃底及脾门处,似脂肪组织。

4、淋巴系统很发达,性成熟时胸腺最大。外来刺激可使淋巴系统增生,因此易患淋巴系统疾病。

5、心脏由左右心房和左右心室组成。心尖位于近胸骨端第4肋间,此处为小鼠心脏采血的进针部位。

6、气管及支气管腺不发达,无咳嗽反射。此外,小鼠易形成动脉粥样硬化病变。对吗啡产生兴奋作用(对处猫以外其他动物起镇静作用),对钩端螺旋体不敏感,对化学致癌物敏感。

7、对蛋白质的要求较其他动物高20%,对维生素E缺乏敏感,可影响受孕,可以体内自生合成维生素C。

8、雌性子宫“Y”字型,卵巢有系膜包绕不与腹腔相通,无宫外孕;乳腺发达,胸部3对、鼠鼷部2对 * * ;雄性为双睾丸,幼年时藏于腹腔内,性成熟后下至阴囊。前列腺分背腹两叶9成熟早,繁殖力强。

阅读理解

“In wilderness(荒野) is the preservation of the world.” This is a famous saying from a writer regarded as one of the fathers of environmentalism. The frequency with which it is borrowed mirrors a heated debate on environmental protection: whether to place wilderness at the heart of what is to be preserved.  

As John Sauven of Greenpeace UK points out, there is a strong appeal in images of the wild, the untouched; more than anything else, they speak of the nature that many people value most dearly. The urge to leave the subject of such images untouched is strong, and the danger exploitation(开发) brings to such landscapes(景观) is real. Some of these wildernesses also perform functions that humans need—the rainforests, for example, store carbon in vast quantities. To Mr. Sauven, these “ecosystem services” far outweigh the gains from exploitation.

Lee Lane, a visiting fellow at the Hudson Institute, takes the opposing view. He acknowledges that wildernesses do provide useful services, such as water conservation. But that is not, he argues, a reason to avoid all human presence, or indeed commercial and industrial exploitation. There are ever more people on the Earth, and they reasonably and rightfully want to have better lives, rather than merely struggle for survival. While the ways of using resources have improved, there is still a growing need for raw materials, and some wildernesses contain them in abundance. If they can be tapped without reducing the services those wildernesses provide, the argument goes, there is no further reason not to do so. Being untouched is not, in itself, a characteristic worth valuing above all others.

I look forward to seeing these views taken further, and to their being challenged by the other participants. One challenge that suggests itself to me is that both cases need to take on the question of spiritual value a little more directly. And there is a practical question as to whether wildernesses can be exploited without harm.

This is a topic that calls for not only free expression of feelings, but also the guidance of reason. What position wilderness should enjoy in the preservation of the world obviously deserves much more serious thinking.

小题1:John Sauven holds that________________.

A.many people value nature too much

B.exploitation of wildernesses is harmful

C.wildernesses provide humans with necessities

D.the urge to develop the ecosystem services is strong小题2:What is the main idea of Para. 3?

A.The exploitation is necessary for the poor people.

B.Wildernesses cannot guarantee better use of raw materials.

C.Useful services of wildernesses are not the reason for no exploitation.

D.All the characteristics concerning the exploitation should be treated equally.小题3:What is the author’s attitude towards this debate?

A.Objective.

B.Disapproving.

C.Sceptical.

D.Optimistic.小题4:Which of the following shows the structure of the passage?

A.

B.

C.

D.CP: Central Point   P: Point       Sp: Sub-point(次要点)    C: Conclusion

判断题