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閱讀理解

　　The dinosaurs once lived happily on the earth．But 65 million years ago，they suddenly died out．What happened to them?

　　Scientists think that a change in temperature may be to blame．They have come up with lots of ideas to explain the end of the dinosaurs．

　　The most famous one is the minor planet (小行星) idea．Let's go back to that day 65 million years ago to see what happened．Everything was OK before a large minor planet suddenly hit the earth．What a terrible hit! It caused big fires，storms，acid rain，and even earthquakes and volcano eruptions．The hit produced a lot of dust,which flew up into the air and blocked the sun for months．The earth became very cold without sunlight．The plants died first．Then the grass-eating animals died of hunger．Then the meat-eating animals could not find food，either．They began to eat each other，but after a while they died out，too．The dinosaurs，either plant-eaters or meat-eaters，did not live through the disaster(災難)．What a sad story!

　　In April，a British scientist thought of a new idea about the death of the dinosaurs．He thinks that after the minor planet hit the earth，the temperature change left more dinosaur boys than girls! Without enough female dinosaurs to hatch the eggs，the dinosaur population became smaller and smaller．

(1)

______ may be the main reason for the dinosaurs dying out according to scientists．

　　A．Big fires　　B．Earthquakes

　　C．Acid rain　　D．Temperature change

[　　]

(2)

The passage mentioned ______ ideas that the scientists came up with about

the end of the dinosaurs．

　　A．two　　B．three　　C．four　　D．five

[　　]

(3)

The underlined expression “volcano eruptions” probably is ______.

　　A．the name of a minor planet

　 B．one kind of dinosaurs

　　C．one kind of disaster　　　　

　　D．the name of an earthquake

[　　]

(4)

The earth became cold because ______.

　　A．the sun refused to rise　　

　　B．the dust kept the sunlight away

　　C．there was too much rain　　

　　D．there were too many dinosaurs

[　　]

(5)

This passage may be found in ______.

　　A．a science fiction　　B．a story book　　 C．a dictionary　　　　 D．a science magazine

[　　]

答案：1．D ;2．A ;3．C ;4．B ;5．D ;

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