题目内容

—Did Jack come back early last night？ —Yes. It was not yet eight o'clock ______ he arrived

A. before
B. when
C. that
D. until

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设向量β可由向量组α1，α2，…，αm线性表示，但不能由向量组(I)α1，α2，…，αm－1线性表示，记向量组(Ⅱ)α1，α2，…，αm－1，β，则()．

A. αm不能由(I)线性表示，也不能由(Ⅱ)线性表示
B. αm不能由(I)线性表示，但可能由(Ⅱ)线性表示
C. αm可由(I)线性表示，也可由(Ⅱ)线性表示
D. αm可由(I)线性表示，但不可由(Ⅱ)线性表示

Section B
Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D.
听力原文：W: May I help you？
M: Yes, I'd like to buy a pair of shoes for my son. These blue ones are on sale, aren't they？
W: Yes, they are 10% off.
M: Good. I'll take them.
W: Will that be cash or charge card？
M: Cash, please. If they don't fit, I can return them, can't I？
W: No, I'm sorry. Sale items cannot be returned or exchanged.
6. For whom will the man buy the shoes？
(6)

A. His son.
B. His daughter.
C. His wife.
D. Himself.

How long is the Changjiang River？ ______.

A. Three thousand, nine hundred miles.
B. One thousand miles.
C. Hundreds of miles.
D. Three miles.

—Why do you think I am not popular among my classmates？ —Maybe you don't talk about topics

A. as if
B. as long as
C. on condition
D. even though