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15.When will the speakers meet?A.This afternoon. B. This evening. C. Tomorrow morning.

3. What does the der lined phrase a surgeB.A great success.C. A s hrp reduction.A.A u en riseD. A severe downturn.

33..What caused the genetic information exchange around 50, 000 years ago?A. Climate change. B.The movement of continent.C.Economic factors. D.Development in technology.

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