1、Unit 1Unit 1Great Great scientistsscientists1. Which scientist discovered that objects in water are lifted up by a force that helps them float? Archimedesan ancient Greek mathematician & physicist2. Who wrote a book explaining how animals and plants developed as the environment changed?Charles Darwi

2、nBritish author of The Origin of Species 3. Who invented the first steam engine?Thomas NewcomenBritish4. Who used peas to show how physical characteristics are passed from parents to their children?Gregor MendelCzech5. Who discovered radium? Marie CurieMarie Curie (1867-1934), Polish and French, won

3、 two Nobel Prizes6. Who invented the way of giving electricity to everybody in large cities?C. Thomas EdisonAmerican inventor7. Who was the painter that studied dead bodies to improve his painting of people? Leonardo da Vinci Italian artist8. Who invented a lamp to keep miners safe underground?Sir H

4、umphry Davy British,discovered the medicinal value of nitrous oxide (一氧化二氮一氧化二氮) as anaesthetic (麻麻醉劑醉劑)9. Who invented the earliest instrument to tell people where earthquakes happened?Zhang HengZhang Heng (78-139), Chinese, invented the first seismograph10. Who put forward a theory about black hol

5、es? Stephen HawkingBritish scientistPara 1the most deadly disease of its day;Neither its cause nor its cure was understood.John Snow choleraJohn Snow :_Cholera:_a famous doctor in London; so expert that he attended Queen Victoria as her personal physician.How would it be controlled?find its cause !f

6、ind its cause !Para 2 There were _ theories explaining the cause of cholera.twoTheory 1Cholera was spread by_floating in the air to attack people.Theory 2Cholera was spread by _ with whichpeople absorbed this disease into their bodies.mealsa cloud of dangerous gasWhich theory is correct?Which theory

7、 is correct?Para 3&4He needed evidence to prove the theory.In 1854 when another outbreak hit London .In two particular streets. Cholera was so severe there that more than 500 people had died in 10 days.timeplaceWhat did he do firstFirst he marked on a map the exact places where all the dead people h

8、ad lived.1.Many of the deaths were near the water pump.2.Some families had no deaths because they had drunk free beer instead of water from the pump.Water !Para 51.The water came from _.2.What did Dr. Snow advise the people in Broad Street to do immediately? And what was the result? He advised peopl

9、e to remove the handle from the water pump and the disease soon began to slow down.the river that polluted by the dirty water from LondonPara 6Supporting evidence _ A.A woman who had moved away from Broad Street died after drinking the water, while her daughter didnt.B.Both a woman and her daughter died after drinking the water in another part of London.C.A woman died after she delivered the water from the pump.D.Although a woman and her daughter didnt live in the Broad street ,they died after drinking the water from the