Leaves, dikes, and reservoirs were all part of their irrigation and flood preventing things. When the Nile flooded each year, the water would rush into the reservoirs and dikes and keep the villages next to the Nile from flooding.
Hope this helps :)
The answer would be number one, the other options are plausible, but they are not as apparent and visual as their manner of dress.
The likely reason as to why the south Vietnam had rejected
the October 1972 draft agreement was because of the fact that it is not allowed
by the NLF to control, causing the draft agreement to be easily rejected at
once.
They use pictures unlike alphabetic letters.