What's the difference between fairly and quite?

[Takashiro]

35．It’s ( ) unusual for me to get angry ,but I was ( ) shocked by my boss’s attitude.
A．completely ;fairly B．fairly ;quite
C．completely ;quite D．quite ;fairly

Why is the key B? I prefer option D. anyone would like to explain it, please?

[Beeesneees]

Although the phrase "quite unusual" would be acceptable, the phrase 'fairly shocked' would be incorrect. You cannot really be 'fairly' shocked because shock indicates a more extreme emotion than 'fair'. 'Fair' indicates a balance.
In the correct answer (B) both parts of the sentence make sense. An ocurrence can be described as "fairly unusual" and you can be "quite shocked".
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Cheers m' dears!

[Takashiro]

Thanks a lot, Beeesneees. Now I fully understand. I seem to have misunderstood something, merely learning this word by means of translating it into Chinese.