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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The ship was ()in a storm off Jamaica.

A. drowned
B. immerged
C. wrecked
D. submitted
单项选择题
She was afraid that unless the train speeded up she would lose her () to Scotland

A. ticket
B. place
C. seat
D. connection
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