21世纪初的突破性生物技术包括()。
A.超分辨率显微镜
B.细胞重编程
C.高通量测序
D.基因编辑
E.冷冻电子显微镜
A.超分辨率显微镜
B.细胞重编程
C.高通量测序
D.基因编辑
E.冷冻电子显微镜
A.绝对平均
B.比较平均
C.相对合理
D.差距比较大
A.0.2
B.0.4
C.0.5
D.0.6
A.计算机多媒体、电子白板呈下降趋势以及手机和电子书包的兴起,硬件技术的发展朝着便携性、移动性、突破空间时间的限制的方向,不用局限于计算机、多媒体教室,能够在任何时间、任何地点发生的学习
B.在2002年以后随着信息化的普及和全民对教育信息化的认可,一些新兴硬件技术开始进入课堂
C.20世纪初,对于教育技术学发展的基础设施的建设主要集中在计算机硬件设备和计算机软件两大领域
D.电子书包是一个便携式终端,但是由于要考虑到推广及国内现实情况,相关研究也是相对较少,因为电子书包的竞争,归根到底还是软件的竞争
A.11
B.21
C.31
D.41
Living alone has become more acceptable in American society.In the past people sometimes think those who lived alone were a little strange.These days,however,several of the most popular TV shows tell the story of men and women who can't meet "the right person" and who plan to be single forever.Many such single people (especially women) feel that they are more free to pursue (追求) their careers (事业) than those who are married.In a way these people are married to their jobs.
1.About 23 million people over the age of 21 were not married in America by 1996.
A.T
B.F
2.Most of men usually get married at the age of 27 in America.
A.T
B.F
3.In the past,people thought it was impossible to live alone.
A.T
B.F
4.Some people in America wouldn't like to get married,because they can't meet "the right person".
A.T
B.F
5.More and more people in the U.S.choose not to marry.
A.T
B.F