science3.doc

1、MagnetThis smallFlat horseshoeIs sold forA toy: we areTold that itWill pick up pinsAnd it does, timeAfter time; laterIt lies about,Getting its redPaint chipped, beingOffered pins lessOften, until atLast we leave itAlone: thenIt leads its ownLife, tradingSecrets withThe North Pole,ReadingInvisible me

2、ssagesFrom the sun.You can use a lever to open a can of paint. Leverage，leverFirst you put a metal stick under the lid. Then you press down on the stick. The lid will lift up.A ramp can help you move things to a higher place.The Earth has a magnetic field. It has two poles, a north pole and a south

3、pole.When you snap a string, it vibrates.When you speak, your vocal cords vibrate.Volume describes the loudness of a sound.When you yell, you make big vibrations in your throat. When you whisper, you make smaller vibrations. cats meowA lions roar can be so loud that you can hear it up to 6 miles awa

4、y.Sounds can be high, low, or in between. Pitch describes how high or low a sound is.The faster the vibrations, the higher the pitch.A male elephant can weigh 16,500 pounds!That is as much as 275 second graders!估计是学生In a baseball game, you would hit a homerun every time. 指月球上 估计是全垒打home run noun C (

5、INFORMAL homer) US a point scored in baseball by hitting the ball so far that you have time to run all the way round the four corners of the playing field before it is returned Bats use echolocation to move around and catch food.The sound vibrations from the squeak move through the air and hit a mot

6、h. The vibrations bounce off the moth and come back to the bat. Then the bat swoops down and catches the moth for a meal.Dolphins make clicking noises to help find food.These workers explore what happens to dummies, or big dolls, in a car crash.Grade 2 完结These are the great-greatgreat-great-grandpar

7、entsof the Sierra Nevadatheir many scars tellof the storms and firesthey have survivedevery year without failtheir huge trunksadd another ringthick in a wet yearwith plentiful rainsthin in a dry oneit takes my wholefamily holding handsfor us to give a hugto the tallestand oldest treein this groveSci

8、entists group environments with similar traits into biomes (BIGHohmz).A biome is an area of land or water that has certain kinds of living and nonliving things. Deserts, forests, and grasslands are examples of biomes.Each biome has a certain kind of climate (KLIGHmit). 天气英文发音的确是写成Meht,但有声发音却是MitHumu

9、s（HYEWmuhs） is broken-down plant and animal material.Humus adds nutrients to the soil. It soaks up rainwater and keeps the ground moist.These parts help plants live, grow, and reproduce. Reproduce means to make new plants like themselves.A young kangaroo develops in its mothers pouch. There it stays

10、 safe.A porcupines sharp quills help it stay safe from other animals. 豪猪豪猪怎么长得跟刺猬一样啊。 。 。Cactuses grow well in Southern California.Cacti 也是仙人掌的复数，都认不出 Cactuses 来了。 。 。A wave of heat blasts your body. You take a deep breath and dry air stings your nose. Dust from the sandy ground covers your shoes. Y

11、ou are in the Sonoran Desert.The soil in a desert is mostly sand. There is little humus to soak up rain water. Rain water trickles down through the desert sand.Succulent 肉质植物没想到芦荟的花是这样的。 。 。Rattlesnakes and coyotes, among others, are nocturnal (nahkTURNuhl). Nocturnal means they sleep during the day and come out at night.Their body coverings blend in with their environment.