单项选择题

Pipes made of plastic are now widely used in building as they are light and do not become （）in water.

A.ripe
B.instant
C.rotten
D.mature

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They were under the（）that the company was doing well, but in fact it was in serious trouble.

A.conclusion
B.expression
C.enjoyment
D.illusion
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This lovely old town has a（）you couldn't find in a big city.

A.condition
B.standard
C.situation
D.charm
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