单项选择题

A．Fishes die in lakes.
B．Elements needed for healthy plant growth are washed out of soft.
C．Trees grow much more slowly than they should.
D．It contributes to climate change and causes frost.
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单项选择题
A．Artistic and economic.B．Concrete and observable.C．Scientific and historical.D．Implicit and abstract.
A．Artistic and economic.
B．Concrete and observable.
C．Scientific and historical.
D．Implicit and abstract.
单项选择题
A．Estate agent and customer.B．Husband and wife.C．Designer and customer.D．House-owner.
A．Estate agent and customer.
B．Husband and wife.
C．Designer and customer.
D．House-owner.
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