A、
There were some pages missing in the old books.
B、
Some old books could not be found in the museum.
C、
Some pages were broken in some old books.
D、
Many pages were turning brown and becoming brittle.
【正确答案】
D
【答案解析】
A、
Pack with plastic material.
B、
Add a lot of chemicals and acids.
C、
Seal in cool.
D、
Pack with wood boxes.
【正确答案】
B
【答案解析】
A、
Wood pulp.
B、
Maize cob.
C、
Animals' skins.
D、
Broomcorn.
【正确答案】
C
【答案解析】
A、
To add chemicals to all old books.
B、
To remove the binding and treat each page individually to remove the acid.
C、
To pack every book with plastic boxes.
D、
To seal in the museum and not show them to the public.
【正确答案】
B
【答案解析】
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