营腐生生活的细菌和真菌，在生态系统中的重要作用是分解有机物。( )

水中生活的各种生物是水域生态系统的重要组成部分．它们之间通过______和______，形成紧密而复杂的联系，同时又都受______环境的影响．其______和______的消长都会影响到人类的生活．

甲捡到了一只母山羊饲养起来，并在良种站花钱为母山羊配种，此后母山羊生了两只小山羊，后失主乙找到甲要羊。本案应如何处理？

A．失主无权要回山羊　

B．母山羊归还失主，小山羊归甲

C．大小山羊全归还失主，失主付给甲饲养费和配种费

D．大小山羊全归还失主，失主付给甲配种费但不付饲养费

某工程为了验证设计参数，按设计规定在施工过程中必须对一新型结构进行测试，该项费用由建设单位支出，应计入（）。

A．建设单位管理费

B．勘察设计费

C．施工单位的检验试验费

D．研究试验费

下列树种耐荫性强的树种是（）

A.银杏

B.八角金盘

C.梅花

D.香樟

Civil trials often involve great complexities that are beyond the capacities of jurors to understand. As a result, jurors’ decisions in such trials are frequently incorrect. Justice would therefore be better served if the more complex trials were decided by judges rather than juries.
The argument above depends on which of the following assumptions

A．A majority of civil trials involve complexities that jurors are not capable of understanding.

B．The judges who would decide complex civil trials would be better able to understand the complexities of those trials than jurors are.

C．The judges who would preside over civil trials would disallow the most complex sorts of evidence from being introduced into those trials.

D．Jurors’ decisions are frequently incorrect even in those civil trials that do not involve great complexities.

E．(E) The sole reason in favor of having juries decide civil trials is the supposition that their decisions will almost always be correct.