单项选择题

ewly-found fossilized tracks in Alaska proved that dinosaurs’migration between Asia and North America took place _____.

A．much earlier than experts previously thought.
B．much later than experts previously thought.
C．after Asia became an independent continent.
D．sometime around 25 million years ago.

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单项选择题

The author is ______.

A．a friend of Abraham Lincoln’s
B．a writer who gives an account of Abraham Lincoln’s biography
C．Abraham Lincoln himself
D．Abraham Lincoln’s autobiography

单项选择题

Which of the following statements is TRUE

A．The author’s mother died when he was only ten years old.
B．The author’s father died when he was six years old.
C．The author and his family moved to Indiana in his eighth year.
D．His grandfather was killed by Indians in a battl