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______may affect the downstream water quality and have an impact on plant life？

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______can promote tourism development？

From the passage, we learn that the author

A. didn't like Raoul's way of delivering the paper
B. didn't realize why Raoul delivered the paper that way
C. didn't know that Raoul came very early in the morning
D. didn't feel it necessary to meet Raoul when he came

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Chains make learning flexible.

A. Right
B. Wrong

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Students can enjoy a simple booking and enrolment procedure in some chains.

A. Right
B. Wrong

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