单项选择题

Work in parapsychology,______, has attracted a relatively small number of scientists.

A．is a very controversial field
B．which a very controversial field is
C．a very controversial field
D．a field very controversial which
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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
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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