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（题干见阅读理解第1题） What do we know abou...

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（题干见阅读理解第1题）

What do we know about the black boxes from Air France Flight 447?

A. There is still a good chance of their being recovered.

B. There is an urgent need for them to be reconstructed

C. They have stopped sending homing signals.

D. They were destroyed somewhere near Brazil.