The author uses power walking as an example mainly because _________.A. it is an outdo

Which of the listed statements is a characteristic of the liquid charged power element use

The author would most likely agree that ______.A．decisions about the locations for power p

What did the researchers find in the experiment？A．Human walking used more energy than bipe

听力原文：（A) The man is holding a backpack in his arms. （B) The hiker has to use walking s

Which is the country with the first commercial power station that makes use of ocean curr

What is NOT the mans suggestion？A．Try to eat less.B．Walk more quickly.C．Use the stairs.D．A