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Questions refer to the following article．
Federal regulators Wednesday approved a plan to create a nationwide emergence alert（警报）system using text messages delivered to cell phones．
Text messages have exploded in popularity in recent years，particularly among young people．The wireless industry’s trade association，CTIA，estimates（估计）more than 48 billion text messages are sent each month．
The plan comes from the Warning Alert and Response Network Act，a 2006 federal law that requires improvements to the nation’s emergency alert system．The act tasked the Federal Communications Commission（FCC）with coming up with new ways to alert the public about emergencies．
“The ability to deliver accurate and timely warnings and alerts through cell phones and other mobile services is an important next step in our efforts to help ensure that the American public has the information they need to take action to protect themselves and their families before，and during，disasters and other emergencies，FCC Chairman Kevin Martin said following approval of the plan．
Participation in the alert system by carriers—telecommunications companies is voluntary， but it has received solid support from the wireless industry．
The program would be optional for cell phone users．They also may not be charged for receiving alerrs．
There would be three different types of messages，according to the rules．
The first would be a national alert from the president，likely involving a terrorist attack or natural disaster．The second would involve“approaching threats”which could include natural disasters like hurricanes or storms or even university shootings．The third would be reserved for child abduction（绑架）emergencies，or socalled Amber Alens．
An alert message wiII NOT be sent if（ ）．
细节理解题。由最后一段的“The first would be a national alert from the president，likely involving a terrorist attack or natural disaster．The second would involve‘approaching threats’ which could include natural disasters like hurricanes or storms or even university shootings．The third would be reserved for child abduction（绑架）emergencies，or socalled Amber Alerts．”对三种信息服务的描述可知A项不是所发信息内容，BCD三项都分别在原文中提到了。
下列关于公司的表述，正确的是（）
以下各项列举了我国常见气象灾害与其发生地区的对应关系，其中正确的一项是（）
根据电视收视率调査，看体育节目的观众中青年人比中老年人要多。
由此可推断出（）
—种海洋蜗牛产生的毒素含有多种蛋白，把其中的一种给老鼠注射后，会使有两星期大或更小的老鼠陷入睡眠状态，而使大一点的老鼠躲藏起来。当老鼠受到突然的严重威胁时，非常小的那些老鼠的反应是呆住，而较大的那些老鼠会逃跑。
以上陈述的事实最有力地支持了以下哪项假说？（）
疾病控制中心对某校髙中三个年级的学生进行抽样做视力状况调查，抽样的方法为分层抽样（按比例抽样），若高中一、二、三年级学生人数分别为626、703、780，样本容量为84，则应从离二年级抽样的学生人数为多少？（）
