Is the sentence Books are food for the brain a idiom?

[Ilia]

English Language Tests, Intermediate level

ESL/EFL Test #558 "English Slang Idioms (300)", question 1

"My friend has a car that I am thinking about buying. Could you inspect it for me to see if there are any mechanical problems with it and if it is worth buying?" Chris asked his best friend. Paul responded, "I don't have a lot of time in the next while to give it a detailed inspection but I can give it a once-......... for you and tell you if I see anything grossly wrong with it."

(a) ever
(b) gazer
(c) peak
(d) over

English Language Tests, Intermediate level

ESL/EFL Test #558 "English Slang Idioms (300)", answer 1

"My friend has a car that I am thinking about buying. Could you inspect it for me to see if there are any mechanical problems with it and if it is worth buying?" Chris asked his best friend. Paul responded, "I don't have a lot of time in the next while to give it a detailed inspection but I can give it a once-over for you and tell you if I see anything grossly wrong with it."

Correct answer: (d) over
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Is the sentence Books are food for the brain a idiom?

Ilia

[Mister Micawber]

.
It is a metaphor, not an idiom.
.
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Native English teacher at Mister Micawber's