题目

读刚果河流域热带雨林分布图，完成下面小题。【1】关于雨林的全球环境效应的叙述，不正确的是( )A.茂密的雨林植被能减弱雨水对地表的冲刷，起到保持水土的作用B.雨林被称为“地球之肺”，深刻地影响着地球大气的碳氧平衡C.雨林能起到类似海绵的作用，促进水循环、调节水平衡D.雨林是世界上繁衍物种最多、保护时间最长的场所，是世界生物基因宝库【2】刚果河流域雨林大面积被毁的根本原因是( )A.历史遗留的迁移农业B.发达国家需要大量木Millions of years ago dinosaurs (恐龙) lived on the earth. In the days of dinosaurs the whole earth was warm and wet. There were green forests and they could find enough to eat. Later, parts of the earth became cold and dry. and the forests there died. Then dinosaurs could not find enough to cat. This must be one reason why dinosaurs died out.We can guess another reason. New kinds of animals came on the earth. Some had big brains and were fast and strong. They could kill dinosaurs. There may be other reasons that we don’t know about yet. Scientists are trying to make more discoveries about dinosaurs.Dinosaurs were of many sizes and shapes (形状). Some were as small as chickens, while some were about 90 feet long.There were also terrible fights between dinosaurs. They might have happened more than 100 million years ago. Though there was no man to see any of the fights, we can be told by the animal’s footprints (足迹) that fight did take place.1.According to the passage, dinosaurs did exist only ______on the earth.A. for millions of years B. millions of years agoC. more than 100 millions years ago D. when it was warm and wet somewhere2. One reason why dinosaurs died out is that______.A. there were too many dinosaurs B. parts of the earth became cold and dryC. the dead forests there could not supply them with enough foodD. they couldn’t find enough to eat3.. One more reason may be that ______.A. new kinds of animals came on the earthB. some fast and strong animals with big brains could kill themC. some dinosaurs were as small as chickens D. some big dinosaurs died in the fights4.We can see from this passage ______.A. scientists are trying to make some dinosaurs B. dinosaurs are dangerous enoughC. dinosaurs are worth studying D. scientists know nothing about dinosaurs