13.Millions of years ago there were many types of dinosaurs on earth.Most dinosaurs were
plant eaters.The Apatosaurus,for example,had a long thin neck so that it could eat leaves from trees.Other dinosaurs were meat eaters.The Tyrannosaurus Rex killed smaller dinosaurs for food.
Dinosaurs were real animals that once lived on the earth,but they died out about 65million years ago.The disappearance of the dinosaurs is in some way a puzzle.Some scientists think that the climate changed suddenly.Fossils of trees tell us that the temperature dropped a lot and that the level of the sea dropped as well.This means that it got suddenly much colder.Perhaps the dinosaurs were too slow to change with the climate.
A new idea is that a meteor crashed into the earth.Scientists discovered a place in Mexico where they think the meteor crashed.They think that there was a lot of dust from the meteor.The dust landed on the plants.Also the dust blocked the sun's light for as long as five year.Many animals,including dinosaurs,were plant eaters,and perhaps the dust killed them.This means there was nothing left for meat eating dinosaurs to eat,and so they died out.But,as many animals from that time didn't die,we are not sure what really happened.
28.Dinosaur probably meansA.
A.恐龍    
B.化石     
C.大象    
D.長頸鹿
29.What is the subject discussed in the text?C
A.Dinosaurs,the real animals living millions of years ago.
B.The two types of dinosaurs.
C.The probable reasons for dinosaurs'disappearance.
D.A meteor crashed into the earth.
30.What are the two possible explanations to the dinosaurs'disappearance?B
A.Temperature dropping and sea level dropping.
B.Climate changing and meteors crashing.
C.The dropping of temperature and sea level.
D.Climate changing and the dust blocking the sun.
31.What is the real cause of the disappearance of dinosaurs?D
A.A meteor's crashing.
B.The dust blocking the sun.
C.The plant eating dinosaurs'death.
D.It is still unknown.

分析 本文是一篇科教類閱讀,屬于議論文,數(shù)百萬年前,地球上有許多類型的恐龍.大多數(shù)恐龍是植物食者,一些是肉食者.本文以此展開談?wù),主要談(wù)摿丝铸埾У脑颍?/p>

解答 28.A.詞義猜測題.根據(jù)全文內(nèi)容,尤其是Dinosaurs were real animals that once lived on the earth,but they died out about 65million years ago.可知,Dinosaurs指的是曾經(jīng)存在過的動物.故可推測出Dinosaurs意為恐龍.故選A.
29.C.細(xì)節(jié)理解題.根據(jù)文章內(nèi)容,尤其是The disappearance of the dinosaurs is in some way a puzzle.以及下文探討氣候,食物等可知,本文主要就恐龍消失的原因做了討論.故選C.
30.B.細(xì)節(jié)理解題. 根據(jù)Some scientists think that the climate changed suddenly.以及A new idea is that a meteor crashed into the earth.可知,本文主要講述了氣候巨變和流星撞擊兩個原因.故選B.
31.D.細(xì)節(jié)理解題.根據(jù)But,as many animals from that time didn't die,we are not sure what really happened.以及The disappearance of the dinosaurs is in some way a puzzle.可知,恐龍消失的原因至今還是個謎.故選D.

點評 本文是一篇科教類閱讀,題目涉及多道細(xì)節(jié)理解題,詞義猜測題.做題時學(xué)生應(yīng)仔細(xì)閱讀原文,把握文章主要內(nèi)容,聯(lián)系文章上下文內(nèi)容并結(jié)合所給選項含義,從中選出正確答案,一定要做到有理有據(jù),切忌胡亂猜測.

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