题干
It's a sunny day
in the farm today. My aunt has a farm. The farm is very small. There are twelve
horses, sixteen cows and fifty hens. My aunt likes tomatoes very much. So she
has many tomatoes in the farm. Look! The tomatoes are red. They are very
beautiful.
My aunt likes potatoes very much.
(g)
C(g) +D(g)发生过程中的能量变化如图，△H表示反应的焓变。