单项选择题

The root cause of the maintenance of consumption level despite the high oil price is that ______.

A．the prices of other products have not been affected
B．oil takes a smaller proportion of world energy
C．people are richer to afford expensive products
D．people are used to living a comfortable life
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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.
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
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