A.Over 260,000.
B.Over 3 million.
C.Nearly 5,000,000.
D.About 4,000,000.
A.More jobs could be provided than before.
B.More people could be educated than before.
C.More books could be printed and distributed.
D.More ways could be used to exchange knowledge.
A.China.
B.Sweden.
C.Egypt.
D.Japan.
A.Around1400.
B.Around1900.
C.Around 400.
D.Around 900.