【简答题】To understand what true happiness is one must ________. A) have as much run as possible during one’s lifetime B) make every effort to liberate oneself from pain C) put up with pain under all circumsta...
【简答题】Read the passage carefully. Then answer the questions or complete the statements in the fewest possible words. Children and adolescents who watch a lot of television are more likely to have antisocial...
【单选题】Compared with the modern Olympic Games, the ancient ones ____________
A.
covered every possible events for males
B.
did not give due respect to women
C.
attracted people from different countries
D.
had more sports events than the modem ones
【单选题】电子商务环境中的国际贸易营销是通过电子信息网络进行的市场营销,与传统国际贸易营销方式相比,它具有的特点不包括( )。
D.
有利于客户与企业之间建立稳固而长期的商务关系
【单选题】某学者利用“影印培养法”研究大肠杆菌抗链霉素性状产生的原因,先将原始菌种涂布在1号培养基上,培养出菌落后,将灭菌绒布在1号上印模,绒布沾上菌落并进行转印,使绒布上的菌落按照原位接种到2号和3号培养基上。待3号上长出菌落后,在2号上找到对应的菌落,然后接种到不含链霉素的4号培养液中,培养后再涂布到5号培养基上,并重复以上步骤。实验过程如图所示。下列相关叙述错误的是
C.
4号与8号培养液中,抗链霉素菌株的比例逐渐增大
D.
在一定时间内4号培养液中大肠杆菌的数量逐渐增多