已知A=(1 2 -2 3, -2 -4 4 -6,2 8 -2 0,-1 0 3 -6)则R(A)=()
A.1 B.2 C.3 D.4
答案是：正确答案为：B
设AmxnBx1=0mx1,证明R(A)+R(B)≤n.
答案是：da12020121710536
1、
下列说法不正确的是（ ）
A、
B、 若B可以由A线性表示且B所含向量的个数小于A所含向量的个数，则B线性相关
C、 任何一个含有零向量的向量组都线性相关
D、 单个零向量一定线性相关，而单个非零向量一定线性无关
答案是：正确答案为：B
The art show was ______ being a failure; it was a great success.
A、 far from
B、 along with
C、 second to
D、 regardl
答案是：正确答案为：A
Many children,_______parents are away working in big cities, are taken good care of in the village.
A、 their
B、 whose
答案是：正确答案为：B
—You don’t seem to be quite yourself today. What’s wrong? —Oh, I’m suffering from a cold. Nothing serious， ______.
A、 y
答案是：正确答案为：C
_________ time and labor, cartoonists generally draw the hands of their characters with only 3 fingers and a thumb.
A、
答案是：正确答案为：A
The big IT company will ______ a new research center in the city.
A、 set up
B、 break up
C、 get up
D、 turn up
答案是：正确答案为：A
It is reported that the police will soon look______the case of the two missing children.
A、 upon
B、 after
C、 into
D、
答案是：正确答案为：C
—How much is the T-shirt ___________? —65 dollars.
A、 worth
B、 cost
C、 worthy
D、 paid
答案是：正确答案为：A
If it_____tomorrow, we will stay indoors to have our training class.
A、 rains
B、 rain
C、 will rain
D、 rained
答案是：正确答案为：A
If the pressure is not ________ immediately, there may be an explosion.
A、 revealed
B、 released
C、 resolved
D、 relie
答案是：正确答案为：B
—Glad to meet you. —____________
A、 So do I.
B、 How are you?
C、 How do you do?
D、 The same to you.
答案是：正确答案为：C
My uncle’s house in the downtown area is much smaller than ours, but it is twice______expensive.
A、 as
B、 so
C、 too
答案是：正确答案为：A
I can leave this note to ________ is in charge of foreign affairs of the university.
A、 who
B、 whom
C、 whoever
D、 wh
答案是：正确答案为：C
Since they aren’t answering my telephone, they ________.
A、 should have left
B、 need have left
C、 would have left
D、
答案是：正确答案为：D
Please write your name in the ______ space at the top of the page.
A、 empty
B、 vacant
C、 blank
D、 hollow
答案是：正确答案为：C
Surprisingly, the accident did very little ________ to either car.
A、 harm
B、 damage
C、 danger
D、 injury
答案是：正确答案为：B
Our new sales manager found out that ______ the job done is not as easy as it first appears.
A、 get
B、 got
C、 gotten
答案是：正确答案为：D
—Come in, please. Make yourself at home. —I’m glad you like it.
A、 Thanks. You have a nice place here.
B、 Oh, this pic
答案是：正确答案为：A
Every means ________ tried, but we still cannot solve this problem.
A、 is
B、 have been
C、 are
D、 has been
答案是：正确答案为：D
When Bob and his friends came, we____our supper then.
A、 had
B、 were having
C、 have
D、 are having
答案是：正确答案为：B
We had a(n) ______ with him about this problem last night.
A、 explanation
B、 impression
C、 exhibition
D、 discussion
答案是：正确答案为：D
Even after the speech was over, the audience ______ leave because they were so deeply moved.
A、 shouldn’t
B、 mustn’t?
答案是：正确答案为：D
___ twice, the postman refused to deliver our letters unless we chained our dog.
A、 Being bitten
B、 Bitten
C、 Havin
答案是：正确答案为：B
What a pity! He____________ the only chance of success.
A、 threw away
B、 put down
C、 gave in
D、 broke off
答案是：正确答案为：A
It will be up to the students to decide ______ the exact content of the college magazine will be.
A、 which?
B、 what
C
答案是：正确答案为：B
If you happen to meet James in Vancouver, ______ the book to him.
A、 give?
B、 confident
C、 gave?
D、 you would give
答案是：正确答案为：A
After going to several interviews, she eventually ________ to get a job.
A、 managed
B、 attained
C、 succeeded
D、 achi
答案是：正确答案为：A
Information about the new system is easy to ______ on the Internet.
A、 like
B、 go
C、 find
D、 open
答案是：正确答案为：C
__________she was invited to the ball made her very happy.
A、 If
B、 That
C、 When
D、 Because
答案是：正确答案为：B
Mr. Smith sold that magnificent cottage of his on the sea 2,000,000 dollars.
A、 at
B、 for
C、 to
D、 by
答案是：正确答案为：B
He is very popular with his schoolmates and feels ________ to win the election.
A、 confusing
B、 confident
C、 convinci
答案是：正确答案为：B
—I put him down for a well-educated man. —___________ ? —I mean that he’s a well-educated man.
A、 I beg your pardon
B、
答案是：正确答案为：A
—How much is the T-shirt ___________? —65 dollars.
A、 worth
B、 cost
C、 worthy
D、 paid
答案是：正确答案为：A
This heavy traffic is ________ for this time of the day.
A、 actual
B、 natural
C、 formal
D、 normal
答案是：正确答案为：D
We talked for morn than three hours without ______ a cup of tea.
A、 to have
B、 having
C、 have
D、 had
答案是：正确答案为：B
That big dictionary_____Tom two hundred dollars.
A、 spent
B、 paid
C、 cost
D、 took
答案是：正确答案为：C
She had golden hair when she was a child, but_________ she got older and older, her hair went darker and darker.
A、 whi
答案是：正确答案为：D
I’d like to come with you but that’s not a promise, don’t ________ it.
A、 count on
B、 call on
C、 live on
D、 wait on
答案是：正确答案为：A
Every means ________ tried, but we still cannot solve this problem.
A、 is
B、 have been
C、 are
D、 has been
答案是：正确答案为：D
The art show was ______ being a failure; it was a great success.
A、 far from
B、 along with
C、 second to
D、 regardl
答案是：正确答案为：A
It is generally considered unwise to give a child___________ he or she wants.
A、 however
B、 whatever
C、 whichever
D、
答案是：正确答案为：B
The company is starting a new advertising campaign to new customers to its stores.
A、 join
B、 attract
C、 stick
D、 tr
答案是：正确答案为：B
I ______ at 130 kilometers per hour when the policeman stopped me.
A、 had driven
B、 have driven
C、 drive
D、 was driv
答案是：正确答案为：D
Over the past decades, sea ice in the Arctic(北极) as a result of global warming.
A、 had decreased
B、 will decrease
C
答案是：正确答案为：C
He began to feel hungry since the previous evening.
A、 not having eaten
B、 not have eaten
C、 not eating
D、 having no
答案是：正确答案为：A
The driver was at______loss when______word came that he was forbidden to drive for speeding.
A、 a; /
B、 a; the
C、 the
答案是：正确答案为：A
There was a knock at the door again, and it was the second time someone ________ me that evening.
A、 has interrupted
B
答案是：正确答案为：C
She had golden hair when she was a child, but_________ she got older and older, her hair went darker and darker.
A、 whi
答案是：正确答案为：D
___________lessons were not difficult.
A、 Our few first short English
B、 Our first few short English
C、 Our few first
答案是：正确答案为：B
Health problems are closely connected with bad eating habits and a______of exercise.
A、 limit
B、 lack
C、 need
D、 dem
答案是：正确答案为：B
This magazine is very ______with young people, who like its content and style.
A、 familiar
B、 popular
C、 similar
D、
答案是：正确答案为：B
When you make a public speech, try your best to make yourself clearly ________ .
A、 understand
B、 understanding
C、 un
答案是：正确答案为：C
Even after the speech was over, the audience ______ leave because they were so deeply moved.
A、 shouldn’t
B、 mustn’t?
答案是：正确答案为：D
The college sports meet was __ till next week because of the heavy rain.
A、 put out
B、 put on
C、 put off
D、 put up
答案是：正确答案为：C
Since they aren’t answering my telephone, they ________.
A、 should have left
B、 need have left
C、 would have left
D、
答案是：正确答案为：D
The hotel was awful!___, our room was far too small. Then we found that the shower didn’t work.
A、 To begin with
B、 Af
答案是：正确答案为：A
The flight was supposed to take off at ten o’clock, but ________ we had to wait until eleven o’clock.
A、 in vain
B、 in
答案是：正确答案为：D
I’d like to introduce you ______ James Stewart, the new manager of our department.
A、 with
B、 to
C、 of
D、 on
答案是：正确答案为：B
It will be up to the students to decide ______ the exact content of the college magazine will be.
A、 which?
B、 what
C
答案是：正确答案为：B
—Come in, please. Make yourself at home. —I’m glad you like it.
A、 Thanks. You have a nice place here.
B、 Oh, this pic
答案是：正确答案为：A
Lord Jim_____a private school five years ago with the money he earned through hard work.
A、 finds
B、 found
C、 founds
答案是：正确答案为：D
I often have conversations with John over telephone, while keep in touch with Tom by__________ letter.
A、 不填;the
B、 不填
答案是：正确答案为：C
Even ______ Paul’s brother lives in Brazil, he has never been there.
A、 although
B、 despite
C、 though
D、 that
答案是：正确答案为：C
That big dictionary_____Tom two hundred dollars.
A、 spent
B、 paid
C、 cost
D、 took
答案是：正确答案为：C
—Can I drive on the free way, Mr. Green? —You can when you____________ a bit more skilled.
A、 will get
B、 are getting
答案是：正确答案为：D
I lost my way in complete darkness and, matters worse, it began to rain.
A、 made
B、 having made
C、 making
D、 to make
答案是：正确答案为：D
Please write your name in the ______ space at the top of the page.
A、 empty
B、 vacant
C、 blank
D、 hollow
答案是：正确答案为：C
He__________ he would be able to leave tomorrow, but it’s beginning to look difficult.
A、 hopes
B、 was hoping
C、 had
答案是：正确答案为：C
The most favorite room is the tidy study with a fireplace, we can watch TV and enjoy the nice scenery outside.
A、 where
答案是：正确答案为：A
—You___________ stop me. —Even if you __________it, I won’t allow you to swim across the river.
A、 mustn’t; dare not do
答案是：正确答案为：D
For many Beijing-ers, dreams of living in ___________ green area are becoming___________ reality.
A、 . a; a
B、 the; th
答案是：正确答案为：A
When I entered the classroom, I found the students ______ the questions in groups.
A、 to discuss?
B、 discuss??
C、 dis
答案是：正确答案为：D
These children are quick ________ learning, and we’ll have them trained in new methods.
A、 from
B、 for
C、 at
D、 on
答案是：正确答案为：C
I’d like to come with you but that’s not a promise, don’t ________ it.
A、 count on
B、 call on
C、 live on
D、 wait on
答案是：正确答案为：A
In our daily life, everyone fails every now and then. It is how you react that makes a_____.
A、 development
B、 differe
答案是：正确答案为：B
His health ________, Tom had to leave the army in 1990.
A、 failing
B、 failed
C、 did fail
D、 had failed
答案是：正确答案为：A
He_____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.
A、 should
B、 must
C、 woul
答案是：正确答案为：B
There was a knock at the door again, and it was the second time someone ________ me that evening.
A、 has interrupted
B
答案是：正确答案为：C
Which do you think is ________, health or wealth?
A、 the best
B、 the better
C、 best
D、 better
答案是：正确答案为：B
The teacher recommended that each student ________ a plan for the summer vacation.
A、 would make
B、 made
C、 make
D、
答案是：正确答案为：C
After I ______ the work of the department, I was transferred to another one.
A、 learnt?
B、 had learnt?
C、 would learn
答案是：正确答案为：B
__________lessons were not difficult.
A、 Our few first short English
B、 Our first few short English
C、 Our few first
答案是：正确答案为：B
I’d like to introduce you ______ James Stewart, the new manager of our department.
A、 with
B、 to
C、 of
D、 on
答案是：正确答案为：B
—Which one can I take? —-You can take__________ of them; I’ll keep none.
A、 both
B、 any
C、 either
D、 all
答案是：正确答案为：D
Only later ______ his notebooks, which contained details of all his thefts.
A、 they came across
B、 did they come acros
答案是：正确答案为：B
I feel like ________ to the landlord of the house to complain about the broken window.
A、 writing
B、 write
C、 to writ
答案是：正确答案为：A
Nowhere else in this area ________ such a beautiful scene.
A、 is it
B、 is there
C、 it is
D、 there is
答案是：正确答案为：B
Because Smith failed to show up for the job interview, he ______ the shortlist of applicants.
A、 had been crossed off?
答案是：正确答案为：C
The newspaper ______ two people were killed in the accident.
A、 says
B、 talks
C、 calls
D、 asks
答案是：正确答案为：A
Our new sales manager found out that ______ the job done is not as easy as it first appears.
A、 get
B、 got
C、 gotten
答案是：正确答案为：D
______ she joined the company only a year ago, she’s already been promoted twice.
A、 Although
B、 Because
C、 If
D、 Wh
答案是：正确答案为：A
They had to give up the plan because they had ______ money.
A、 come up to
B、 got along with
C、 ran out of
D、 taken c
答案是：正确答案为：C
We had a(n) ______ with him about this problem last night.
A、 explanation
B、 impression
C、 exhibition
D、 discussion
答案是：正确答案为：D
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