单项选择题

Mary boasted that she would succeed where others had failed.

A．threatened
B．warned
C．bragged
D．joked
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单项选择题
A dream usually consists of visual images that tell a story.
A．graphics
B．vapors
C．pictures
D．fantasies
单项选择题
Project Skylab was designed to demonstrate that a person can work and live in space for prolonged periods without ill effects.
A．unexpected
B．obvious
C．adverse
D．immediate
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