two key products China traded with other countries were?

Question

A. Silk and Porcelain.

B. books and Camles.

C. Gold and silver ******

D. fish and grain

what helped spread knowledge throughout China during its golden ages?

A. porcelain  tablets ****
 
B. the Grand Canal

C. silk

D. books

.

what helped to protect Japan from invasion?

A.its language

B. the sea around it

C. a harsh desert

D. the army of Kublai kahn

PLZ HELP

Katt · Answer

I am not sure, but5 I think the first is silk and porcelain.
Im pretty sure the the second one is books. From what i have learned, it was books and the trade system (gossip, in a sense)
And the third one... Im pretty sure of the sea around it

Katt · Answer

In the past, the sea around Japan helped to protect them from invasion. However, after the USA developed the atom bomb, the difficulty of invading Japan influenced them to drop the atom bomb.