单项选择题

A．He’s worried about whether he can finish his presentation tomorrow.
B．He’s nervous but he believes he’ll be better tomorrow.
C．He’s nervous about his presentation because he’s unprepared.
D．He’ll finish writing his presentation tomorrow.
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Who once had to learn the Auto-Tune technique from T-Pain
A．Dixie Chicks.
B．Metallica.
C．Diddy.
D．Prince.
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In 2008, scientists encountered the top of the ionosphere all______.
A．thanks to the weak solar activity
B．because of the advanced CINDI
C．by chance
D．as predicted
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