To determine the domestic real cost of each chicken in Singsong, we'll use the given cost ratio between fish ([tex]$F$[/tex]) and chicken (C).
In Singsong:
- The ratio is [tex]$1 F = 2 C$[/tex]
This means that one fish is equivalent to two chickens. Conversely, we can express the cost of one chicken in terms of fish.
Since [tex]$1 F = 2 C$[/tex], one chicken ([tex]$1 C$[/tex]) is half of that in terms of fish:
[tex]\[ 1 C = \frac{1}{2} F \][/tex]
Therefore, the domestic real cost of each chicken in Singsong is:
[tex]\[ 1 C = \frac{1}{2} F \][/tex]
So, the correct answer is:
[tex]\[ \text{is } \frac{1}{2} \text{ fish}. \][/tex]