单项选择题

—The book isn't easy for Jack to understand, is it—______. His foreign language is far better than expected.

A．No, it isn't
B．I'm afraid not
C．I don't think so
D．Yes, it is
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—De you know who invented______ telephone—No, but it is really______ telephone
A．the; the
B．/; the
C．the; /
D．the; a
单项选择题
At the______ of the bell, the students rushed into the classroom.
A．sight
B．noise
C．voice
D．sound
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