单项选择题

This passage mainly focuses on ______.

A．life history on Earth
B．animals and plants in the world
C．disappearances of animals and plants in Australia
D．discoveries of new animals and plants in Australia

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热门试题

单项选择题

It is most probable that the author will discuss in the passage that follows this one______.

A．the Tasmanian tiger
B．European arrival in Australia
C．the Australian National Parks and Wildlife Service
D．social problems in Australia

单项选择题

Which of the following is NOT true

A．During the past two centuries, 19 species of animals have disappeared in Australia.
B．Life on Earth is about 3.5 million years old.
C．By the end of this century about one million species could become extinct.
D．At least 250 million species of animals and plants have lived on Earth.