中华民国的国家元首制度在事实上接受了法律制约，选择了法制化管理，对国会负责。()
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简述汉初封国制产生的原因及其汉中央对诸侯王的政策。
Which of the following sentences is grammatically INCORRECT？
A. From this come three tons of pure sulphur(硫磺).
B. Arthritis is a disease causing pain and swelling in the joints of the body.
C. Billiards is Mr. Fox"s favorite recreation.
D. All the machinery has arrived undamaged.
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