This passage mainly tells us that
A．parents' love for their children is great.
B．it is dangerous for parents to reunite with their children in a disaster.
C．we should develop reasonable plans for disasters.
D．the U. S. government has been well prepared for disasters.

判断题两个总体的分布形态，不会影响两独立样本t检验。()

判断题I类错误可能的原因是由于样本数据自身的误导性。()

未分类题According to the federal official, the decline of application for citizenship was caused byA．the increase of citizenship fee.B．unstable economy.C．various reasons.D．the upcoming revisions to the U. S. citizen test.

判断题因接受不同实验处理而造成各组间的差异是组间变异。()

未分类题Which of the following is true according to this passage?A．The illegal immigrants always outnumber the legal ones in the U. S.B．The legal immigrants always outnumber the illegal ones in the U. S.C．There are about 8.5 million illegal immigrants in the U. S.D．Most illegal immigrants come from Latin America.

判断题F检验时要注意区分假设检验是单尾还是双尾的。()

未分类题From this passage, we can learn thatA．there would be no more political and social turmoil in the U. S. without illegal immigrants.B．the Washington government has two think tanks.C．the government is trying to solve the issue of illegal immigration.D．the U. S. Congress does not want to solve the issue of illegal immigration.

判断题在无法考察总体时，要从总体中抽取能代表总体的样本作为考查对象。()

未分类题Whats the reason for the decrease of the number of illegal immigrants?A．The political and social disorder in the U. S.B．American's struggling economy and the increased enforcement of immigration laws.C．Their unwillingness to do low-skilled jobs.D．The increased return migration.

未分类题The word 'cinch'(Line3, Para.1)most probably meansA．a very easy thing.B．a very complex thing.C．a great challenge.D．an extremely hard problem.

判断题数据的存储结构是数据的逻辑结构在计算机存储器上的实现，它是依赖于计算机的。()

单项选择题绝对优势理论的主要代表人物是()A、亚当.斯密B、大卫·李嘉图C、里昂惕夫D、保罗·萨缪尔森

未分类题It can be inferred from the second paragraph thatA．low-altitude clouds are the main causes of global warming.B．increase of cloud cover can slow down the climate change.C．global warming will increase cloud cover.D．increase of cloud cover can speed up the global warming.

判断题幼儿园的管理层次中，基层为具体工作层，即各班级或班组。()

未分类题The new study published in Science indicates thatA．low-level clouds tend to warm the ocean.B．more cloud cover means a warmer world.C．the warming of ocean is a threat to the low-level clouds.D．the Pacific Ocean has more low-level clouds than before.