单项选择题

Certain pine trees are deliberately dwarfed for______ purposes.

A．constructive
B．dimensions
C．ornamental
D．decorated
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单项选择题
Though science is often imagined as a disinterested subject, scientists are no different from anyone else: they are ______ human beings enmeshed (陷入:卷入) in a web of personal and social circumstances.
A．vulnerable
B．rational
C．careless
D．passionate
单项选择题
The American society is______ an exceedingly shaky foundation of natural resources, which is connected with the possibility of a worsening environment.
A．established on
B．affiliated to
C．originated from
D．incorporated with
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