单项选择题
The word “cultivate” has five senses which can be explained by its different synonyms, namely farm, develop, court, foster, and improve. The following are five sentences each of which contains a different sense of “cultivate”. Please analyze the meaning of cultivate in each sentence and fill in the brackets after each sentence with the corresponding synonym.
Try to cultivate a positive mental attitude. ( )
A、farm
B、develop
C、court
D、foster