单项选择题

The backpack's electricity comes from ______.

A．the gears with battery-powered devices
B．the motion of the whole backpack while one walks
C．a mechanism with gears
D．an electrical generator

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单项选择题

Which books most probably talk about peoples of the places you are going to visit

A．Lonely Planet: Healthy Travel: Asia & India & 1,000 Places to See Before You Die.
B．Lonely Planet: Healthy Travel: Asia & India & Spain.
C．Unforgettable Journeys to Take Before Yon Die & Lonely Planet: Healthy Tratvel: Asia & India.
D．Unforgettable Places to See Before You Die & 1,000 Places to See Before You Die.

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.

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