单项选择题

Which of the following is wrong about Redwall limestone cliff

A．It is one of the most spectacular features of the Grand Canyon.
B．It is practically vertical.
C．Its average height is 550 feet.
D．It enjoys the same fame with the Washington Monument.

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单项选择题

What happened in the year 1839 according to the passage

A．Charles published his first book.
B．Charles got married.
C．Charles had his first child.
D．Charles produced a paper together with Wallace.

单项选择题

What did Charles Darwin see in Chile

A．Earthquakes and volcanoes.
B．Coral and coral islands.
C．Bodies of millions of tiny creatures.
D．Fossils.