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问题 选择题

君臣礼仪是中国古代政治制度发展的外在表现。图1到图3的变化反映的实质是[]

图1（汉）坐面论道 
 图二（宋）站议时政 
图三（清）跪受笔录
[ ]

A．封建制度的完善B．生活习惯的变化C．社会文明的进步D．君主权力的强化

答案

答案：D

单项选择题

Forty percent of the rats included in an experiment were male rats. If some of the rats died during the experiment and 30 percent of the rats that died were male rats, what was the ratio of the death rate among the male rats to the death rate among the female rats ？（）

A.A

B.B

C.C

D.D

E.E
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填空题

电子燃油喷射系统油压和喷嘴孔口开启大小都是固定的，供油量靠改变（）实现。
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