单项选择题

The electricity-generating packs are likely to be dangerous to us ______.

A．while lighting his way
B．when playing video games, watching TV, and listening to music, all at the same time
C．while crossing the street
D．at the time when creating powers

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热门试题

单项选择题

In near future people relying on battery-powered devices to get around and do their work don't need to give up space in their packs to lots of extra batteries because ______.

A．their heavy packs can make electricity
B．battery-powered devices will be improved a lot
C．they typically carry heavy backpacks
D．global positioning system (GPS) receivers and night-vision goggles work themselves

单项选择题

What books are advertised in the above five book advertisements

A．Travel Guides' Handbooks.
B．Health Books.
C．Tourists' Books.
D．Travel Photographers' Books.