单项选择题

The old lady was ______ to the young man who helped her find her lost grandson.

A．touched
B．grateful
C．cheerful
D．generous
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单项选择题
Sliver is the best conductor of electricity, copper ______ it closely.
A．followed
B．to follow
C．following
D．being followed
单项选择题
_____ of them knows about the plan because it was secret.
A．Some
B．No one
C．Any
D．None
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