Complete the sentence with the correct ending. Ben Finney's main academic work investigates the way that
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A
activities of tourists and scientists have harmed the environment.
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B
some sites in space could be important in the history of space exploration.
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C
vehicles used for tourism have polluted the environment.
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D
it may be unclear who has responsibility for historic human footprints.
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E
past explorers used technology in order to find new places to live.
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F
man-made objects left in space are regarded as rubbish.
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7
astronauts may need to work more closely with archaeologists.
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8
important sites on the Moon may be under threat.