Idiom
A black sheep

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

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Idiom
To smell a rat

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

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Idiom
Mutation is

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

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