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573.Though he is in his late sixties,the well-known biologist begins each day _________ a sense of adventure and a sense of curiosity.
A.in
B.with
C.of
D.at
574.It was clear that the small grocery was _________ people he owed money to.
A.at the expense of
B.at the risk of
C.in the way of
D.at the mercy of
