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生态系统中存在着能流、物流和______。

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Questions 11 to 18 are based on the conversation you have just heard.

A. He arrived at the theater late.
B. He left his watch in the theater.
C. The production seems much shorter than it actually was.
D. He did not enjoy the production.

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People usually place an early bid in case the bidding ends too soon with someone choosing _______________.

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The employer agreed to ______ (就提高工人工资向工人作出让步).

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Questions 11 to 18 are based on the conversation you have just heard.

A. She thinks the price is too high.
B. She thinks the price is quite normal.
C. She thinks the price could be cheaper.
D. She thinks the price is really low.

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