单项选择题

A （） biologist studies the fish and other living things in the oceans.

A. merry
B. typical
C. professional
D. marine

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单项选择题

In 1937 Eleanor Roosevelt, who was a disceming stateswoman in her own right, became the first wife of a United States President to hold a press conference. （）

A、perceptive
B、controversial
C、generous
D、respected

单项选择题

We were working （）time to get everything ready for the exhibition.

A. against
B. in
C. on
D. ahead

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