单项选择题

What does this passage mainly talk about

A．Doctor's advice on how to improve our health.
B．The advantages of walking.
C．Walking and calories.
D．How to find me for walking.
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单项选择题
The suggested plan was to ______.
A．turn on all lights
B．mm off all electricity for a short time
C．shut off the fights in cities
D．dim all lights
单项选择题
People decided to honor Edison when ______.
A．he made his electric light
B．the first invention was made
C．he died more than 70 years ago
D．the country realized the importance of electricity
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