复数练习题加答案

OP?R?5?2?7

；

z?OM

时

z

有最小值

OP?R?5 ?2?3

小结：求复数的模的最值常常根据其几何 意义，利用

图形直观来解．

名词的数

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一。单向选择题

1. Have you got __________? I want to write a

letter.

A. any paperB. papers C. any papers D. a paper

. Have you seen such big ________?

A. a tomato B. tomato C. tomatoes D. tomatos

. They got much __________ from those books.

A. ideas B. photos C. information D. stories

. There are a lot of _________ down there but

hardly any __________.

A. sheeps, people B. sheep, people C. sheeps,

peoples D. sheep, peoples

.

–

What can I do for you?

-- I

’

d like two ____________.

A.

bottle

of

orange

B.

bottle

of

orangesC.

bottles

of orangeD. bottles of oranges

.

Several

___________

are

talking

under

the

tree.

And their __________ are swimming in the lake.

A.

woman,

childrenB.

woman,

childC.

women,

children D. women, child

. Uncle Wang bought two ____________ yesterday.

A. watchs B. watches C. watch D. watched

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. Tom has made __________ with Jim.

A. a friend B. friendsC. friendD. some friends

.

What

can

I

do

for

you?

I

’

d

like

two

__________.

A. box of appleB. boxes of applesC. box of apples

D. boxes of apple

10. Let me give you ____________.

A. an adviceB. some advice C. advices D. the

advice

11. He has spent a great _________ of money on

his new house.

A. deal B. many C. number D. piece

12.

I

only

realized

age

when

I

found

I

had

__________.

A. much great hair B. a little great hair C. a

few grey hairs D. some grey hair

13. That farmer has many _________ on his farm.

A. geeesB. goosen C. gooses D. geese

14. When we saw his face, we knew ________ was

sad.

A. some news B. the news C. a newsD. news

15.

The

dentist

didn

’

t

tell

me

how

many

_________

I should pay for pulling out the tooth.

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A. money B. dollars C. funds D. moneies

16. Before we moved in the new house we bought

many ___________.

A.

furnituresB.

furniture C.

pieces

of

furniture

D. equipments

17. His friend lost _________ nylon stockings

yesterday morning.

A. two B. a C. a couple of D. a pair of

18.

My

family

raise

a

lot

of

_________,

including

two ___________.

A.

cattles,

cows

B.

cows,

cattle C.

cattle,

cows

D. cow, cattles

19.

All

the

________

are

made

of

___________,

not

plastics.

A.

glass,

glass

B.

glasses,

glass

C.

glass,

glasses D. glasses, glasses 0. A group of __________

are eating ________ and_________ at the foot of the

hill.

A.

sheep,

grass,

leaves

B.

sheeps,

grasses,

leaves C.

sheep,

grass,

leaf

D.

sheeps,

grass,

leaf1.

About0

________

of

the

population

in

our

country

________ on farms. < /p>

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A.

percent,

lives

B.

percents,

lives C.

percent,

liveD. percents, live

2. The number of people invited ________ fifty,

but a

number of

them ________

absent

for different

reasons.

A. were, was B. was, wasC. was, were D. were, was

3. My father

’

s ________ is grey, but my mother

has a few grey _________.

A. hair, hairB. hairs, hairs C. hairs, hair D.

hair, hairs

4. ----How many ____________ does a cow have?

----- Four.

A.

stomaches

B.

stomachC.

stomachs D.

stomachies

5.

Father

went

to

his

doctor

for

____________

about his heart trouble.

A. an advice B. advice C. advices D. the advice

6. The _________ of buildings are covered with

lots of _____________.

A.

roofs,

leaves

B.

rooves,

leafs

C.

roof,

leafD. roofs, leafs

7. As is known to us all, _________ travels much

faster than__________.

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A.

lights,

sounds

B.

light,

soundC.

sound,

lightD. sounds, lights

8. ---What would you like, sir?

---- _____________.

A. Two cups of coffees B. Two coffees C. Two cup

of coffeeD. Two cups coffee

9. These ___________ want to be __________ when

they grow up.

A. girl-students, woman doctorsB. girl-student,

woman doctors

C.

girls-students,

women

doctors

D.

girl-students, women doctors

0. What ________! Where did you get them?

A.

a

big

fish B.

big

fish C.

a

piece

of

fish D.

a piece of big fish

1. I saw _________ running about at the foot of

the mountain.

A.

a

cattle B.

two

cattlesC.

much

cattle

D.

a

head

of cattle

2. ______________! Let

’

s go climbing!

A. What a fine weatherB. How fine weatherC. What

a fine dayD. How fine day

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3.

–

Thanks for giving me _________ I wanted.

A.

the

information

B.

an

informationC.

the

informations D. information

二。填入所给单词的正确形式。

1. I have two .

2. There are many here.

3. I received a lot of Christmas. There are many.

Those are

enjoying

the

suise.

.

A

few are

drawing

on

the wall. . . The 10. Yangtze River in one of the

longest in China.

三。写出下列单词的复数形式。

match

_____________

____________foot____________half

fish

piano

___________wish

___________

_____________

____________fox__________

glass____________

cattle

story___________

radio____________

scarf_________

party_____________

life

____________photo______________ leaf ___________ boy

_____________

box

__________

goose_____________

mouse__________ sheep _____________ shop __________

city______________

hero

_________

German___________

zoo

____________

deer

______________man___________

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Negro_____________

baby_________

woman____________

thief____________ tooth____________ child___________

Chinese___________

policeman__________

wife

____________

Japanese___________

brush__________

tomato__________

knife____________

factory__________

monkey___________

wolf

bamboo

_____________

___________

map

_____________

stomach___________

ox__________

girl

student

________________

pencil-box

_______________

man

doctor

_______________

woman

teacher

______________

一、选择题

3

－

i

1

．复数等于

1

－

i

A

．

1

＋

2iB

．

1

－

2iC

．

2

＋

iD

．

2

－

i

答案：

C

3

－

i4

< br>＋

2i

解析：＝

2

＋

i.

故选

C.

21

－

i

3

＋

2i3

－

2i

2

．复数＝

2

－

3i2

＋

3i

A

．

0 B

．

C

．－

2iD

．

2i

答案：

D

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3

＋

2i3

－

2i13i

－

13i

解析：＝＝－

i

＋

i

＝

2i.

132

－

3i2< /p>

＋

3i13

z

＋

2

3

．已知

z

是纯虚数，

z

等于

1

－

i

A

．

2i B

．

i C

．－

iD

．－

2i

答案：

D

解析：由题意得

z

＝

ai.< /p>

．

z

＋

22< /p>

－

a

＋i∴，

21

－

i

则

a

＋

2

＝

0

， ∴a＝－

2.

有

z

＝－

2i

，故选

D.

．若

f

＝

x3

－

x2

＋

x

－

1

，则

f

< br>＝

A

．

2i B

．

0 C

．－

2iD

．－答案：

B

解析：依题意，

f

＝

< br>i3

－

i2

＋

< br>i

－

1

＝－

i

＋

1

＋

i

－

1

＝

0< /p>

，

选择

B.

2

－

i

5

．复数

z

＝在复平面内对应的点位于

< br>

1

＋

i

A

．第一象限

B

．第二象限

C

．第三象限

D

．第四象

限

答案：

D

2

－

i13

解析：

zi

，它对应的点在第四象限，故选