Idiom
A black sheep

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

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Idiom
To smell a rat

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

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Idiom
Mutation is

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

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