Idiom
A black sheep

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

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Idiom
To smell a rat

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

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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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