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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】C 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 year...
A.
To warn people of emergencies via messages.
B.
To popularize the use of cell phones.
C.
To estimate the monthly number of messages.
D.
To promote the wireless industry.
【单选题】C 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 year...
A.
the US federal government
B.
mobile phone users
C.
the carriers themselves
D.
the law of the United States
【单选题】D With around 100 students scheduled to be in that 9 am Monday morning lecture, it is no surprise that almost 20 people actually make it to the class and only 10 of them are still awake after the firs...
A.
Functions of the body clock.
B.
The “night owl” phenomenon.
C.
Human beings’ sleep behaviour.
D.
The school schedule of “early bird”.
【单选题】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, p...
A.
a child loses his way
B.
a university shooting happens
C.
a natural disaster happens
D.
a terrorist attack occurs