单项选择题

She’s just started—it’ll take her a week or two to learn the （）

A. rules
B. ropes
C. cases
D. things

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It was ______ of the Queen to speak to the elderly patients.
A. gracious
B. graceful
C. grateful
D. generous
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Doctors are interested in using lasers as a surgical tool in operations on people who are ______ to heart attack.
A. infectious
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C. disposed
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