单项选择题

Doctors see a connection between increase amounts of leisure time spent______ and the increased number of cases of skin cancer.

A．to sunbathe
B．to have sunbathed
C．having sunbathed
D．sunbathing
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单项选择题
Certain pine trees are deliberately dwarfed for______ purposes.
A．constructive
B．dimensions
C．ornamental
D．decorated
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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