单项选择题

A．Medical research.
B．Ballpoint pens.
C．Children’s games.
D．Jewelry settings.
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单项选择题
A．Astronauts’ clothing.B．Products made in space.C．Costume jewelry.D．Problems in manufacturing.
A．Astronauts’ clothing.
B．Products made in space.
C．Costume jewelry.
D．Problems in manufacturing.
单项选择题
A．sightB．frontC．placeD．part
A．sight
B．front
C．place
D．part
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