单项选择题

The tone of the passage is ______.

A．sentimental
B．serious and regretful
C．depressed
D．light yet mockingly serious
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单项选择题
The main purpose of this passage is ______.
A．to prove that man is a descendent of some higher animal
B．to satirize human greediness
C．to prove that man is superior to other animals
D．to criticize man as a maniac
单项选择题
H5N1 is a flu strain ______.
A．limited to Hong Kong
B．which first affected human beings in 1961
C．crossing species barriers
D．which was first isolated from American birds
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