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。()

未分类题What could be concluded from the research on the menopause of women?A．Environment changes would make a difference of one's reproduction.B．The beginning of menopause symbolized the lessening of hormones.C．The period of menopause demonstrated an adult women's maturation.D．Migrants entered menopause later than those who stayed in their birth place.

未分类题Unlike others, people with slight dark triad personalities are more likely toA．run the risk of being avoided by others.B．be left alone and attacked by predators.C．enjoy a productive and successful sex life.D．ruin the good relationship.

未分类题Gianmarco Ottaviano and Giovanni Peri point out that immigrationA．is immune from negative effects.B．has lead to economic prosperity and social stability.C．has enhanced wages of most American workers.D．will root out illegal documentation of workers.

判断题三十六字母大约反映了先秦时期的声母系统。()

未分类题The plan of creating a new class of 'guest workers'A．has aroused criticism from conservatives, liberals and the business world.B．has allowed immigrants to work in the U.S. for six consecutive years.C．will benefit both businesses and immigrant labor employers.D．will give people a good reason to threat such workers as slaves.