人口的增长会对资源、环境和__________产生巨大的影响。为了保护所有 生物

（每空2分，共12分）仔细阅读下 * * 段文字

①由稀有气体元素Xe（氙）与氧元素形成的一种共价化合物XeO₃极不稳定，易转化为单质而呈强氧化性。将适量的XeO₃投入含Mn²⁺的水溶液中，溶液逐渐变为紫红色且pH不断减小。

②将0.08mol KMnO₄固体（质量为12.64g）加热一段时间后，收集到a molO₂；

向反应后残留的固体中加入足量的浓盐酸，又收集到b molCl₂，此时Mn元素全部以Mn²⁺的形式存在于溶液中。

③氧化还原反应中实际上包含氧化和还原两个过程。下面是一个还原过程的反应式：    Cl₂+2e^- ＝2Cl^-         

回答问题：

（1）试写出①有关的离子方程式：_________          _______。

（2）请配平②的化学方程式：

KMnO₄+   HCl －    KCl+   MnCl₂+   Cl₂↑+   H₂O

通过对第②段文字中提供的数据进行推导和计算可得出：

a +b的最大值为      ，a +b最小值为     。

（3）下列四种物质中能使③中的还原过程发生的物质是     。

A．Na₂CO₃

B．KMnO₄

C．XeO₃

D．Na₂SO₃将该反应的氧化剂和还原剂的化学式及其配平后的系数填入下列方框中，并用单线桥表示电子转移的方向和数目：

防止仰卧位综合征，以下措施中不恰当的是（）。

A.产妇取左侧倾斜30°体位

B.垫高产妇右髋部，使之左侧倾20°～30°

C.产妇取头高足低位

D.常规开放上肢静脉输液

E.预防性输液500ml

Zoology（动物学）is the part of science that deals with the study of the animals’ growth, home and behavior. It has nothing to do with people, so many students are left wondering why they have to learn it.

Our nature includes not just humans but plants and animals as well. Everything in our environment is connected in a complex cycle. If you have a better understanding of how animals would behave and work with us, then you would value nature better.

Some animals are actually misunderstood by people like sharks and snakes. These creatures are thought of as human killers, and this is mainly because we don’t understand why they behave that way. In zoology you would be able to learn natural behavior as well as their homes so you would completely understand why they would behave in a defensive(防御的) manner when they seem to be threatened. Studying zoology would help people achieve clearness over the common myths we have on different wild animals.

Studying zoology would help people know the real facts about animals. One of the negative facts is the decreasing numbers of some species of animals. It makes people realize that there is a need for nature to be always balanced. We need animals to keep the balance in our environment and for humans to survive as well. It would help us learn the needs that animals lack and we can respond by thinking of solutions we can give to the endangered species of animals.

Modern progress is needed for a country to grow in terms of its economy; however, it should not force us to destroy our rainforests and oceans. People should realize that our modern lives should include the lives of the animals that live with us. They should not be contained in zoos but in their natural homes as well. We will learn that every living creature on the earth has the right to own a home and we need to fight for them to have permanent(永久的) homes.

小题1:According to the text, nature should be       .

A．left alone

B．treated seriously

C．taken for granted

D．taken lightly小题2:It is implied in Paragraph 4 that animals play a role of        .

A．making our world beautiful

B．protecting species of plants

C．providing food for humans

D．keeping nature in balance小题3:To animals, humans should act as        .

A．caretakers

B．killers

C．competitors

D．trainers小题4:The best title for the passage may be “     ”.

A．The Ways of Protecting Animals

B．The Importance of Studying Zoology

C．The Introduction to Zoology

D．The Advantages of Learning Zoology

一项工程甲3天完成，乙6天完成，问两人一起做，几天可以完成（）

A．1

B．2

C．3

D．4

铁道的标准轨距为（）毫米。

A、1535

B、1435

C、1335

D、1635