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单项选择题

A．Because they can fly very high.
B．Because they can carry larger freight over within a shorter time.
C．Because they are the newest form of transport.
D．Because they can go somewhere that cannot be reached by other transports.
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单项选择题A．That the man can rely on her instead.B．That the man should not bother the director with this.C．That the director will help him out.D．That the man had better not expect much of the director.

A．That the man can rely on her instead.
B．That the man should not bother the director with this.
C．That the director will help him out.
D．That the man had better not expect much of the director.

单项选择题A．It is an act of despair.B．It is an act of selfishness.C．It is the result of a sudden decision.D．It is the result of a sense of guilt.

A．It is an act of despair.
B．It is an act of selfishness.
C．It is the result of a sudden decision.
D．It is the result of a sense of guilt.