Who will end the friendship with the person that is in your life for a reason?
A. The person himself.
B. You.
C. Neither you nor the person.
D. Both you and the person.
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What does a “friend for a season” mean?
A. Someone who is good at making you laugh.
B. Someone who teaches you how to have fun.
C. Someone who will stay in your life for a short time.
D. Someone who comes into your life only for fun.
What is a lifetime friend?
A. Someone who always helps you out of difficulties.
B. Someone who understands you better than anyone else.
C. Someone who has experienced hardships with you.
D. Someone who together with you makes up a single soul in two bodies.
What is the passage mainly about?
A. Three different stages of friendship.
B. Three different types of friendship in our life.
C. Three different ways of getting along with people.
D. Three different lessons on how to be good to your friends.
5．若A为6阶方阵，齐次方程组Ax=0基础解系中解向量的个数为2，则r(A)（）
A. 2
B. 3
C. 4
D. 5
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