单项选择题

Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.
At the present time the brush can NOT be used to ______.

A．sweep up tiny pieces of nanodust
B．paint microstructures
C．soak toxins from water
D．find medical uses
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单项选择题
Evading taxes by corporation in America is ______.
A．a thing of the past
B．an established practice
C．on the way of rising
D．not so serious as the public think
单项选择题
Which of the following is TRUE of Emily Dickinson
A．She was not a productive poet.
B．She was not a sociable person.
C．She saw many of her poems published.
D．She communicated only with seven people.
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