单项选择题

设n元齐次线性方程组Ax=0的一个基础解系为α1,α2,α3,α4,则下列向量组中为Ax=0的基础解系的是()

A.α1-α2,α2-α3,α3-α4,α4-α1
B.α1+α2,α2+α3,α3+α4,α4+α1 
C.α1,α1+α2,α1+α2+α3,α1+α2+α3+α4
D.α1+α2,α2+α3,α3-α4,α4-α1

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单项选择题

【案例分析题】

I have thousands of classes since I started school rune years ago.But only one (51)was the most important.
It happened Iast term just after I had got a (52)result in an exam.l was sad and had lost my confidence.l decided to go to a class which can tell me how to be (53).
The speaker walked into the room.But he did not start talking like a teacher.Instead,he held up a twenty yuan note(钞票)!
’Who wants this?’he asked.(54)0f’us in the class put up our hands.
He smiled.Then he put up the note on the blackboard and asked the same question.A-gain,we all put up our hands.He smiled again but said (55).Suddenly,he threw the note on-to the floor!Then he asked the same question a (56)time.
I didn’t understand what the speaker was doing.Why was he asking the same question a-gain and again?I wanted the note,(57)I put my hand up again.After a while,he (58)the note and started to laugh.’You have all just told me how to become successful.’
’The note is worth(价值)20yuan.It is (59)worth 20yuan,even though I threw it on the floor.You are like the note.Whatever happens to you,you still have your worth.
Suddenly I (60)I was worth a lot.l may have done poorly in an exam,but it doesn’t mean I can’t do well in the future.If I believe in myself,l will be successful!

51.()

A. school 
B. class 
C. exam 
D. term

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