Idiom
A black sheep

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

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Idiom
To smell a rat

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

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Idiom
Mutation is

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

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