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问题 选择题

2011年4月20日，以“科技、创新、未来”为主题的济宁市首届青少年科技节在济宁学院附属小学拉开序幕。青少年参加此项活动有利于  [ ]

①激发学科学、爱科学、讲科学、用科学的热情 

②培养创新精神和动手动脑能力 

③从根本上改变我国科技落后的局面 

④促进科学素养的全面提升

A．②③④  

B．①②③  

C．①②④   

D．①②③④

答案

答案：C

填空题

原型化过程一般是在获得系统的一组______后，即快速地加以实现。
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单项选择题

Mrs. Cray, an African American, is admitted to the hospital after sustaining a hip fracture. She is 5 ft. , 4 inches tall and weighs 96 lbs. She has five children and has used estrogen replacement therapies for 10 years. She told the nurse that she "just stepped forward and fell. " The results of her bone density tests indicate she has osteoporosis. Which of the following is the greatest risk factor for osteoporosis for this woman

A. Her long-term use of estrogen.
B. Her weight.
C. Her family.
D. Her rac
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