单项选择题

If one buys InfoMate, what comes with it free of charge

A．An AC/DC adapter.
B．Four AA rechargeable batteries.
C．A 12 volt car cigarette charging cord.
D．Supersonic earplugs.
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单项选择题
Suppose you are hiking in the country. In an emergency when the batteries have run out, the best alternative to get power for the radio is______.
A．to expose the radio to the sunshine
B．to use standby batteries that are charged
C．to crank the dynamo
D．to plug it into a cigarette lighter
单项选择题
What Cause's the soup can to swell
A．Meat.
B．Sulfur dioxide gas.
C．Hydrogen sulfide.
D．Pathogen.
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