单项选择题

Humans should not develop their economy at the（）of the ecological environment.

A. destruction
B. pollution
C. expense
D. mercy

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A laser beam is used to （）even the hardest substance.

A. light up
B. repair
C. identify
D. penetrate
单项选择题
The composers soon began to write musical dramas（）about Bible stories in church.

A. to perform
B. performing
C. to be performed
D. be performed
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