Idiom
A black sheep

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

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Idiom
To smell a rat

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

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Idiom
Mutation is

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

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