单项选择题

Our research has focused on a drug which is so () as to be able to change brain chemistry.

A. powerful
B. influential
C. monstrous
D. vigorous

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单项选择题
The word cunning probably means ().

A. scheming
B. skill
C. sense
D. wisdom
单项选择题
What does the author suggest as far as Abraham Lincoln’s characteristics are concerned().

A. Indefinable peace.
B. Admirable perfect.
C. Paradox of extremes.
D. Stem but approachable.
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