单项选择题

The announcement was widely hailed in the media as a ______ but the extent of the restrictions was not specified.

A．implementation
B．breakthrough
C．interpretation
D．breakdown
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单项选择题
Recently, great advances have been made in the study of Mars' surface by the use of radar waves to ______ the dense cloud layer.
A．hover
B．pierce
C．penetrate
D．plunge
单项选择题
The passage is mainly about ______.
A．generation gap
B．establishment and authority
C．the young and their ambition
D．reward according to ability not according to age
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