five.
46 -According to the passage, the dominant belief among scientists is that ---- .
A) throughout history there have been periods when many species of life have become
extinct
B) the present climatic change known as global warming is probably a natural
phenomenon
C) the Earth is in danger of being struck by an asteroid
D) the present decline in the number of species is caused by the activities of mankind
E) we are experiencing the fifth period of species dying out
47 -From the passage, we understand that the term "homo sapiens" is ---- .
A) a method of analysing fossils
B) a way of referring to a large number of species of flora and fauna
C) another term for the human race
D) an irreplaceable ecosystem which is being destroyed
E) a hostile environment in which many species die
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