初一的題目（科學(xué)和英語(yǔ)）
科學(xué)：
小明用100牛的水平方向的力去推放在水平面的桌子,課桌在30秒內(nèi)勻速移動(dòng)了6米.已知課桌的質(zhì)量為30千克.求：
（1）課桌受到的摩擦力為多大?
（2）小明推課桌的速度為多少?
英語(yǔ)嘻……
Thomas Edison was one of the greatest inventors in the world.Without his inventors,people may not have lights,films and many other things.But this very elever man had very little scholing.
Edison began to make a talking machine in 1877.At first,he used paper to make a soud.He worked for months on this idea.At last he found out how to record a person's voide.But the first machine was very simple and the voice was ones on the talking machine.This time the voice could be played back and the voice was also very clear.After the World War II,others used his methods,and then came the first modern tape recorder.It is much easier to record.How great Edison was
1.Edison _________ very little schooling when he ___ young.
2.The first talking machine he invented __________ very slmple and the voice _________ ___________ ________
3.The first modern tape recorder _________invented ________ the World War II