单项选择题

Some of the rubbish, such as food, paper and iron, ______ away over a long period of time.

A．rot
B．rots
C．is rotting
D．are rotted
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单项选择题
You should impress the news learned from the radio this morning ______ your mind.
A．in
B．into
C．inside
D．upon
单项选择题
For a start, Apple has had the tablet field to itself for a year, allowing it to refine its offering and ______the bar for rivals.
A．rise
B．rose
C．raised
D．raise
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