阅读理解。
When the world was very young, people lived only in hot places. They did not live in
cold places because they could not keep warm there.
At first men do not know how to make a fire. Sometimes trees were hit by lightning.
Then a fire was started. People took some of the fire near their homes. A fire was very
important for three reasons. It kept them warm. Wild animals were frightened when they
saw it. And when food was cooked, it tasted much better.
But men did not know how to make a fire. When they had a fire, they did not let it
stop burning. If it went out (熄灭), they could not start it again. They had to wait for
lightning to start another fire. Sometimes they had to wait for years.
Later, they learned how to make a fire. But it was not easy to make something burn.
Now we have matches. We can carry them in our pockets and make a fire when we want
to.
1. "When the world was very young" means "_____". [ ]
A. before liberation (解放)
B. in the following years
C. before long
D. millions of years ago
2. People found that _____. [ ]
A. the cooked food tasted better than the uncooked food
B. the uncooked food tasted much better than the cooked food
C. wild animals enjoyed the cooked food
D. wild animals kept warm near the trees
3. People didn't let a fire stop burning because _____. [ ]
A. they were not able to make a fire
B. they liked to wait for lightning
C. it rained now and then
D. they didn't like to make a fire
4. Now we can make a fire _____. [ ]
A. by lightning
B. if it is necessary
C. for three reasons
D. in our pockets
（表1）
（表2）