Without water, _________ no plants or animals.

I am wondering if they are ____ or____.

_________ in a person’s speech or writing usually ranges on a continuum from casual or colloquial to formal or polite according to the type of communicative situation.

1_____there is no rain,farming is difficult or impossible

1_____education is the instruction that occurs when the instructor and students are separated by distance or time,or both

在关系数据库设计中，设计关系模式属于数据库设计的________。

关于数据仓库设计，下述说法正确是______。

设a="a",b="b",c="c",d="d",执行语句x=IIf((a＜B)Or(c＞D)，"A","B")后，x的值为______。

设a="a"，b="b"，c="c"，d="d"，执行语句x=Iif((a＜b)Or(c＞d)，"A"，"B")后，x的值为______。(2005年4月)

网络拓扑设计的优劣将直接影响着网络的性能、可靠性与________。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

在软件设计中，不属于过程设计工具的是______ 。