B
He has forgotten that some things can have both good and bad effects at the same time.
C
He is looking too hard to find someone to blame for a mistake they might have made.
D
He is trying to find an excuse not to eat fruit because it is expensive.
Key: B
Justification
Sergei thinks that doctors and dentists can’t both be right. However, he has forgotten that it
is possible for things to have positive and negative consequences at the same time – in this
case, fruit contains fibre and vitamins which are good for health, but also lots of sugar which
is bad for your teeth.
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