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
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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
单项选择题
The foreign student advisor recommended that she______ more English before enrolling at the university.
A．studied
B．study
C．would study
D．was studying
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