单项选择题

A．Since
B．Although
C．However
D．Only if
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单项选择题
What will definitely happen upon Telstar X’s reentry
A．It will distintegrate.
B．There could be damage to houses.
C．The satellite will no longer function.
D．Many pieces will fall into the oceans.
单项选择题
What is a hopper
A．It is a clerk.
B．It is a bill.
C．It is a box.
D．It is a vote.
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