According to the text, which of the following factor in childhood will probably cause an adult to be less fertile?
A．Menopause period.
B．Infectious disease.
C．Vigorous exercise.
D．Reproductive hormones.

判断题组织是两个或两个以上的人所组成的协作系统，管理者应在这个系统中处于相互联系的中心，并致力于获得有效协作所必需的协调。()

未分类题In Paragraph 2, Gillian Bentleys research showed us thatA．women staying in Sylhet had a high level of reproductive hormones.B．women born in London were less fertile than those migrates from Sylhet.C．reproduction level of adult women varied in different regions.D．where you spend your childhood might affect the fertility of adult women.

判断题普通话以北京话词汇为词汇规范。()

未分类题Migration here in the experiment isA．a measuring tool.B．a research methodology.C．an independent variable.D．a controlled condition.

判断题民事主体实施一定民事法律行为，就是为了使原有的民事法律关系在内容、客体、主体等方面发生变化。()