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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单项选择题

A．They don’t enjoy swimming.B．They won’t go swimming in the lake today.C．They don’t know how to swim.D．They’ll swim in the lake tomorrow.

A．They don’t enjoy swimming.
B．They won’t go swimming in the lake today.
C．They don’t know how to swim.
D．They’ll swim in the lake tomorrow.

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.