before
at
different
Not long ago a rare new species of bird-like dinosaur 6 ______________ (discover) in Chaoyang County, Liaoning Province. When scientists inspected the bones, they were surprised 7 ________(find) that these dinosaurs could not only run like the others but also climb trees.
was discovered
to find
Dinosaurs died out suddenly about 65 million years ago. Some scientists think it came after an 8 __________ (expect) incident when a huge rock from space hit the earth and put too much dust into the air. 9 _______ think the earth got too hot for the dinosaurs to live on any more. Nobody knows for sure 10 ____ and how dinosaurs disappeared from the earth in such a short time. unexpected
Others
why
1. The
最高级前用the。 2. They
替代前句中的dinosaurs。 3. before
指在人类出现很久之前。 4. at
表示“在那时”是at that time。 5. different
在名词kinds前作定语,用形容词。 6. was discovered
主语与discover是被动关系,又与ago连用,可知用一般过去时的被动语态。 7. to find
在作表语和补语的形容词后作状语只能用不定式。 8. unexpected
指“突如其来的”事件。 9. Others
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