【单选题】2019年3月18日上午,习近平在京主持召开学校思想政治理论课教师座谈会并发表重要讲话。他强调,思政课是落实立德树人根本任务的( ),发挥不可替代的作用。
【简答题】黄柏的来源有( )、( ) , 入药部位是 ( ) 。
【单选题】均匀平面波由介质1垂直入射到理想导体表面时,产生全反射,入射波与反射波叠加将形成驻波,其电场强度和磁场的波节位置()
【单选题】均匀平面波由介质垂直入射到理想导体表面时,产生全反射,入射波与反射波叠加将形成驻波,其电场强度和磁场的波节位置_________。
【多选题】一导游人员应劝阻游客自由活动的情况包括( )。
【单选题】What is the role of the statement 'Our careers provide the most concrete evidence that were moving forward.' with reference to the previous statement in the paragraph?
A.
To offer further explanation.
B.
To provide a definition.
C.
To present a contrast.
D.
To illustrate career development.
【单选题】Which of the following statements would provide the most of logical continuation of the final paragraph of the passage?
A.
Thus Wynne — Edwards' theory raises serious questions about the constancy of animal population in a region.
B.
Because Wynne- Edwards' theory is able to explain more kinds of animal behavior. than is the density-dependent theory, epideictic explanations of population regulation are now widely accepted.
C.
The results of one study, for instance, have suggested that group vocalizing is more often used to defend territory than to provide information about population density.
D.
Some of these studies have, in fact, worked out a systematic and complex code of social behavior. that can regulate population size.
E.
One study, for example, has demonstrated that birds are more likely to use winter-roosting aggregations than group vocalizing in order to provide information on population size.