单项选择题

These researchers intend to ______ this research until there is some substantial finding.

A．insist on
B．call on
C．live on
D．carry on
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单项选择题
Light levels are carefully controlled to fall within an acceptable level for ______ reading convenience.
A．intentional
B．ideal
C．obligatory
D．standard
单项选择题
He was easily hurt because his feelings were very ______.
A．sensible
B．sensational
C．sensitive
D．senseless
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