（）thesurfaceofmetal,butalsoweakensit

A．tochooseasystemofeducation
B．topreparechildrenmainlyfortheirfuturework
C．toleteveryonereceiveeducationfitforhim
D．tobuildaperfectworld

A．DanishKrone
B．CubanPeso
C．DeutscheMark
D．JapaneseYen

A．whycertainpeoplearesoonerthanothers
B．howtomakepeoplelivelonger
C．thesizeofcertainpeople’sbrains
D．whichpeoplearemostintelligent

A．whycertainpeoplearesoonerthanothers
B．howtomakepeoplelivelonger
C．thesizeofcertainpeople’sbrains
D．whichpeoplearemostintelligent

A.lose
B．expense
C．cost
D．price

A．thatbuysthegoods
B．thatsellsthegoods
C．wherethegoodsareproduced
D．wherethegoodsareshipped

A．DanishKrone
B．DeutscheMark
C．CubanPeso
D．DutchFlorinGuider

A．leave
B．leftto
C．leftoff
D．leftfor

A．shipment
B．draft
C．hilloflading
D．credit