题目内容

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.恐龙    
B.化石     
C.大象    
D.长颈鹿
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 本文是一篇科教类阅读,属于议论文,数百万年前,地球上有许多类型的恐龙.大多数恐龙是植物食者,一些是肉食者.本文以此展开谈论,主要谈论了恐龙消失的原因.

解答 28.A.词义猜测题.根据全文内容,尤其是Dinosaurs were real animals that once lived on the earth,but they died out about 65million years ago.可知,Dinosaurs指的是曾经存在过的动物.故可推测出Dinosaurs意为恐龙.故选A.
29.C.细节理解题.根据文章内容,尤其是The disappearance of the dinosaurs is in some way a puzzle.以及下文探讨气候,食物等可知,本文主要就恐龙消失的原因做了讨论.故选C.
30.B.细节理解题. 根据Some scientists think that the climate changed suddenly.以及A new idea is that a meteor crashed into the earth.可知,本文主要讲述了气候巨变和流星撞击两个原因.故选B.
31.D.细节理解题.根据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,恐龙消失的原因至今还是个谜.故选D.

点评 本文是一篇科教类阅读,题目涉及多道细节理解题,词义猜测题.做题时学生应仔细阅读原文,把握文章主要内容,联系文章上下文内容并结合所给选项含义,从中选出正确答案,一定要做到有理有据,切忌胡乱猜测.

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