The library is ____ the post office and the supermarket.

A. among B. between C. on D. across

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US companies pay almost $10 billion a year to protect their property with alarm systems and human guards. Mobile robots may be cheaper.

1.Why are robots of this kind called mobile robots?

A. Because they are able to climb stairs.

B. Because they are able to send an alarm.

C. Because they can open doors.

D. Because they can move around slowly on wheels.

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