____是人类在能量转化方面的最早的一次技术革命，导致了以____作为主要能源的时代的到来，这就是人类第一次能源革命．

用简便方法计算，写出主要计算过程．

12.5×3.7×0.8=____

— What does that man look like?

— He's of medium height and very ____.

       One day Daddy and I went out    1    a walk. On the way we   2   a lot of people. We went up and   3  a look. Oh, dear!   4  did we see? There   5  a donkey(驴) in the middle of the road. It would not move. The cars and buses could not get 6  .
Then a policeman came. " 7  donkey is this?" he asked. "It' s   8   ," said a farmer, "but I   9  move it. " The policeman and the farmer did 10 best to move the donkey, but it would not move. We laughed, but the  11   of the cars and the buses were   12   . "We can't move the donkey," the farmer and the policeman said. "What shall we do?"
"Give him a carrot," my father said.
"   13 a good idea!" said the farmer.
Soon he found a   14 and showed it to the donkey. When the donkey saw a carrot, it jumped up and walked after the farmer.  15   the cars and buses could get past at last.