Explanation:

- The passage discusses the muskmelon and its benefits during the hot season.

- It mentions the fruit’s high water content that aids in replenishing fluids.

- Blank 1: The phrase "muskmelon is (1)______ perfect summer..." likely requires an adjective.

- Blank 2: After "summer," a noun is needed, like "fruit."

- Blank 3: Discusses being "(3)______ in water content," suggesting "rich."

- Blank 4: Before "care," a verb such as "take."

- Blank 5: Regarding "fluid loss," it pertains to the body’s fluids, so option 2, body’s, fits well.

Therefore, option 2, body’s, is indeed the most appropriate.