Idiom
A black sheep

An unlucky person
A lucky person
A partner who takes no share of the profits
None of these
An ugly person

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Idiom
To smell a rat

To see signs of plague epidemic
To suspect foul dealings
None of these
To be in a bad mood
To get bad small of a bad dead rat

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Idiom
Mutation is

a factor responsible for plant growth
a change which affects the parents
a change which affects the offspring of F2 generation only
a change that is inherited

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