问题 选择题

下列反应的离子方程式正确的是                                  (    )

A.氢氧化铁溶于氢碘酸中:Fe(OH)3 + 3H+ → Fe3+ + 3H2O

B.明矾净水的离子方程式:Al3+ + 3H2O Al(OH)3 (胶体) + 3H+

C.过氧化钠投入重水中:2Na2O2 + 2D2O→4Na+ + O2↑+ 4OD-

D.向氢氧化钡溶液中逐滴加入少量碳酸氢钠溶液:Ba2++2OH- +2HCO3-→BaCO3↓+2H2O + CO32―

答案

BC

选择题
完形填空

Most people have no idea of the hard work and worry that gosintosthe

collecting of those fascinating birds and animals that they pay to see in the

zoo.One of the questions that is always asked of me is __1__ I became an animal

collector in the first __2__ .The answer is that I have always been interested

in animals and zoos.According to my parents, the first word I was able to say

with any __3__ was not the conventional“mamma”or“daddy”,__4__ the word“zoo”,

which I would __5__ over and over again with a shrill __6__ until someone,

insgroupsto __7__ me up, would take me to the zoo.When I __8__ a little older,

we lived in Greece and I had a great __9__ of pets, ranging from owls to

seahorses, and I spent all my spare time __10__ the countryside in search of

fresh specimens to __11__ to my collection of pets.__12__ on I went for a year

to the City Zoo, as a student __13__ , to get experience of the large animals,

such as lions, bears, bison and ostriches,__14__ were not easy to keep at

home.When I left, I __15__ had enough money of my own to be able to __16__ my

first trip and I have been going __17__ ever since then.Though a collector's job

is not an easy one and is full of __18__ ,it is certainly a job which will

appeal __19__ all those who love animals and __20__ .

1.A.how B.where C.when D.whether

2.A.region B.field C.place D.case

3.A.clarity B.emotion C.sentiment D.affection

4.A.except B.but C.except for D.but for

5.A.recite B.recognize C.read D.repeat

6.A.volume B.noise C.voice D.pitch

7.A.close B.shut C.stop D.comfort

8.A.grew B.was growing C.grow D.grown

9.A.many B.amount C.number D.supply

10.A.living B.cultivating C.reclaiming D.exploring

11.A.increase B.include C.add D.enrich

12.A.later B.further C.then D.subsequently

13.A.attendant B.keeper C.member D.aide

14.A.who B.they C.of which D.which

15.A.luckily B.gladly C.nearly D.successfully

16.A.pay B.provide C.allow D.finance

17.A.normally B.regularly C.usually D.often

18.A.expectations B.sorrows C.excitement D.disappointments

19.A.for B.with C.to D.from

20.A.excursion B.travel C.journey D.Trip