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何为子程序嵌套?

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简述子程序分层编程？

[音频]Part I Listening Comprehension (25%)Section ADirections: In this section, you’ll hear five short conversations. After each conversation, a question will be asked about what was said. The conversation and question will be read only once. Listen carefully and choose the best answer to each question.1.

A. They are both anxious to try Italian food.
B. They are likely to have dinner together.
C. The man will treat the woman to dinner tonight.
D. The woman refused to have dinner with the man.

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2.

A. It’s only for rent, not for sale.
B. It's not as good as advertised.
C. It's being redecorated.
D. It's no longer available.

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3.

A. The next bus is coming soon.
B. The bus will wait a few minutes at the stop.
C. There are only two or three passengers waiting for the bus.
D. They can catch this bus without running.

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