1.Water Is Needed for Life
水是生命之源
2.Using Energy to Ride a Bike
用能量骑自行车
3.Fixing a Flat
修理瘪胎
4.Animals of the Forests
森林里的动物
5.A Listening Walk in the Forest
漫步在森林里聆听自然
6.The Constellations
星座
7.AVisitto a Planetarium
参观天文馆
8.Grow Your Own Vegetables
种属于自己的蔬菜
9.What Is a Veterinarian?
什么是兽医?
10.Are Dogs Getting Healthier?
狗更健康了吗?
11.The Features of EaCh’S Surface
地球表面的特征
12.Down the Mississippi River
沿密西西比顺流而下
13.Simple Machines
简单机械
1 4.A Simple Solution
一个简单的解决方法
15.The Scientific Discovedes of Benjamin Franklin
本杰明·富兰克林的科学发现
16.How Do Kites Fly?
风筝是怎样飞行的呢?
17.The Truth About Sharks
有关鲨鱼的真相
18.The Crittercam
动物摄影机
19.Types of Clouds
云的种类
20.Meteorologists Predict the Weather
气象学家对天气的预测
21.Fruits and Vegetables:A Key to Good Health
水果和蔬菜:身体健康的关键
22.Exotic Fruits
异国小果
23.Crossing the Land with Steam Power
使用蒸汽的力量横穿陆地
24.Robert Fulton and the Steamboat
罗伯特·富尔顿和蒸汽船
25.Seasons Around the World
全球的季节
26.Staying Warm in Winter
冬季保暖
27.What Is a MammaI?
哺乳动物
28.Mammals with Pouches
带有育儿袋的哺乳动物
29.How to Organize a Great Science Fair Project
怎样安排一次重要的科学展示项目?
30.ATasteful Science Experiment
一次美味的科研实验
31.Rocks and Minerals
岩石和矿物质
32.The Hope Diamond
希望之星
33.How Cacti Survive with Little Water
仙人掌怎么能在几乎没有水的条件下生存?
34.Flowering and Nonflowering Plants
开花植物和不开花植物
35.The Honeybee and Pollination
蜜蜂和授粉
36.Waste and Recycling
废物与回收
37.Our Class Recycling Project
课堂上的有关回收的课题
38.Elijah McCoy,Inventor
发明家以利亚·麦科伊
39.Why Do We Say That?
我们为什么那样说?
40.The Push and Pull of Magnets
磁铁的斥力和引力
41.Making Magnets
制作磁铁
42.The Senses
感觉
43.A Fish 0ut of Water
不在水里的鱼
44.Telescopes and Microscopes
望远镜和显微镜
45.An Important Scientist
一位重要的科学家
46.The Life Cycle of a Tree
树的年轮
47.Growing Applesauce
“长出来”的苹果酱
48.How Animals Defend Themselves
动物们怎样保护自己
49.Animals Keeping Clean
动物保持干净
50.Is There Life on Mars?
火星存在生命吗?
51.Our Solar System
我们的太阳系
52.A Journey Through the Eye
眼睛的旅程
53.Eye Care Through the Ages
爱眼史话
54.SpidersThat LassoTheir Prey
套捕猎物的蜘蛛
55.The Art of Herb Gardening
草药园艺艺术
56.Getting the Salt out of Salt Water
去除盐水中的盐
57.What Causes Static Electricity?
什么引起静电?
58.What Makes a Hurricane?
飓风怎样形成7
59.The Day ofthe Hurricane
飓风日
60.Where Have All the the Grasslands Gone?
草原去哪里了?
01.Hunting Buffalo:AWayof Life
捕猎野牛:一种生活方式
62.Arachnids
蛛形纲动物
ANSWER KEY