复习Book3Unit4.

1、astronomer astronomy billion violent violence atmosphere dinosaur thus satellite climate spaceship lessen religion religious theory globe globalfundamental multiply oxygen gravity extinct crash development developed up cheers that out birth lay 摆桌子：lay desksfrom stop out out hang out turn on mind de

2、pend on it thathow it came into being As he wasnt ready make it a rule to speak English there , too to see as bright as four times as large as three times as many as (4) The current yield is three times what was ten years ago. B Our teacher of geography held a classmeeting in order to encourage us t

3、o study astronomy.He gave us some useful advice， saying that we depend on it that wedefeat the difficulties by ourselves.Meantime，the geography monitor alsomade a speech，which cheered us up.Every one of us made up our minds tostudy harder.As long as we get the hang of the waysof learning astronomy，w

4、e can learn it well.puzzling puzzled puzzlement in puzzling about/over puzzled puzzle puzzlement puzzling massive of masses mass in the mass The mass of down ones life out laid off laid some money aside lying lied laid laid lie massive puzzling masses laid puzzle C B D C B on one ahead take at times in no time prevention from doing sth. prevent from leaving energyprotect his child from over on on watch out for Now that prevent from in time watch over at a time The production now is three times what it was ten years ago.Now that everyone