单项选择题

It's ______ to send letters by email than by post.

A．far faster
B．farther fast
C．farther faster
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单项选择题
These old men need some help, ______
A．needn't they
B．don't they
C．need they
单项选择题
The iron ball is too heavy for me ______.
A．to rise
B．to rise it
C．to raise
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