A. oil.
A: C.
Painting oil paintings is one of their spare time activities.
Analysis: First of all, the landlord accidentally turned painting into planting. At first, he thought that the option was to change the soil, but later he thought that it was impossible to make a clerical error in all four options. A search on the Internet turned out to be painting!
Look up oil: 4 oils [pl] paint made by mixing pigments in oil.
One of the most surprising things is that _ _ _ _ may come from oil.
Lots of food for tomorrow.
Most of tomorrow's food
A: d
One of the most surprising things is that most food in the future may be extracted from oil.
Analysis: food is an uncountable noun, not many, excluding B.
Tomorrow is a noun, which means "the future". You can use the noun possessive or possessive of to exclude a.
The design of this question is wrong.
Looking up the dictionary, we know that the future world can be said as follows: tomorrow's world "2 1 century"
It can also be said: tomorrow's world "Oxford double solution"
So CDs are ok. But d is better, because c is not concise enough and of is used too much.