单项选择题

What can be inferred about the relationship between laser communications and radios

A．Lasers have replaced all the radio devices.
B．Lasers have more advantages over radios.
C．Laser communications are based on radio devices.
D．Lasers are more widely applied in war than radios.
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单项选择题
The new device is called talking binoculars probably because ______.
A．scouts can use them to share information efficiently as if they are talking to each other
B．scouts can use them to talk to each other just as they do with cell phones
C．they can transform video images to sounds as if they are talking to the scouts
D．they send out sounds to warn the scouts once the enemy is detected
单项选择题
Without the talking binoculars, a scout during radio silent scouting missions ______.
A．can be easily detected and located by the enemy
B．is not able to determine the enemy's target position
C．has to make a record of what he has observed
D．risks getting caught when returning to report back
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