一个国家或地区人口性别比例失调的影响因素主要是
A.人类生殖学和生物学特点改变B.人口老龄化和高龄化C.人口流动D.社会因素E.医学领域新技术、新方法的应用
参考答案:D
短文改错。(10分)
Mother’s Day is a popular holiday in many country. It is on the second Sunday in May(五月)It are a day to thank others. In that day we give flowers, cards or other present to our mothers. On the card, we usual write “Thank your, mother”, “To the best father in the world”, “Best wish for Mother’s Day” and so on. On Mother’s Day, we help us mothers do a lots of house work. We try to make our mothers happy.
2009年2月12日,美国各地举行活动纪念某位前总统诞辰200周年。奥巴马在华盛顿参加纪念活动中发表演说,他说他特别感激这位伟人,因为有了这位伟人,他才有可能成为美国的第一任黑人总统。有关这位伟人的事迹表述中,你认为正确的是[ ]
A.领导独立战争
B.起草美国宪法
C.挑起南北战争
D.颁布《解放黑奴宣言》