单项选择题

The doctor ______ Billy's operation with x-rays and special exercises to make him stronger.

A．took on
B．followed up
C．started up
D．went after
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单项选择题
The joys of travel, having long ______ the disabled, are opening up to virtually anyone who has the means.
A．neglected
B．missed
C．discarded
D．omitted
单项选择题
The wildlife biologist told my father the sanohill cranes ______ through Warner were rare and vanishing creature.
A．moving
B．entering
C．migrating
D．emigrating
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