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【单选题】
According to the passage, what are the supposed carriers of the type of flu virus called H5N1?A.
Birds that people bought in a live-poultry market.
B.
Domestic animals, such as horses and cows.
C.
Domestic fowls, such as chickens.
D.
Fish that people kept as their food.
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【单选题】The thing he felt most proud was his gold watch .
A.
which
B.
that
C.
of which
D.
for which
【简答题】名词解释： 6.频率给定方式：
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