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在队列研究中，暴露组的疾病发病率与对照组的疾病发病率的差值称为AR。()

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形式美的基本组合规律有齐一与参差、对称与均衡、调和与对比、比例与尺度、节奏与韵律、多样与统一。()

慢性汞中毒的典型表现是易兴奋症、汞毒性震颤、汞毒性口腔炎。()

Last year she began to be addicted to gambling and now she is up to her ears______debt.

A. for
B. on
C. with
D. in

He was extravagant in his way of living so his wife______with him to be more frugal.

A. pleaded
B. begged
C. entreated
D. requested