单项选择题

Question 30 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. Now listen to the news.

A．skin diseases.
B．pneumonia.
C．hepatitis.
D．HIV.
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单项选择题
A．hungerB．floodC．insect pestD．natural disaster
A．hunger
B．flood
C．insect pest
D．natural disaster
单项选择题
What did Dr. Edwin Land invent
A．A quick process of developing film.
B．A new kind of film.
C．An automatic printer.
D．A kind of camera that develops its own film.
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