单项选择题

San Francisco is usually cool in summer, but Los Angeles ______.

A．is seldom
B．is scarcely
C．barely is
D．rarely is
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单项选择题
______ the Hubble Space Telescope, astronomers detected the two small, faint moons orbiting Pluto in the Kupier Belt.
A．To use
B．Using
C．Having used
D．Use
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