No, Baofeng radios, such as the UV-5R and other similar models, cannot pick up CB (Citizens Band) radio frequencies directly.
CB radio operates on a specific set of frequencies around 27 MHz, which is in the HF (High Frequency) range.
In contrast, most Baofeng radios are designed to operate on VHF (Very High Frequency, typically 136-174 MHz) and UHF (Ultra High Frequency, typically 400-520 MHz) bands.
These ranges do not overlap with the CB frequencies.
To listen to CB radio transmissions, you would need a receiver that is specifically capable of receiving HF signals in the 27 MHz range. CB radios themselves, or dedicated CB radio receivers, are usually the most straightforward tools for accessing this band.