单项选择题

When you ______ your health, you are less worried about getting ill and not being able to support your family.

A．insure
B．assure
C．ensure
D．secure
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单项选择题
When you look at a mirror, you can see a an ______ of your face in the mirror.
A．impact
B．imagination
C．image
D．likeness
单项选择题
The Clarks' three sons Tom, John and Jack are 12, 14 and 15 years old ______.
A．comparatively
B．relatively
C．respectively
D．collectively
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