单项选择题

What do you know about the River Nile

A．It’s the largest river in the world.
B．It often flooded large areas.
C．It’s the second longest river in the world.
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单项选择题
The main idea of the first paragraph is ______.
A．life on land probably began about 430 years ago
B．the first animal on land came from oceans
C．there wouldn't be animals without plants
D．plants are the only form of life that is able to get and store energy
单项选择题
Which of the following is tree
A．Algae has existed for more than 430 million years.
B．It is impossible that algae might be the earliest plant on land.
C．Plants get food from animals in the oceans.
D．Evolution began after animals appeared on land.
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