单项选择题

Witmer's research leads people to believe ______.

A．Tyrannosaurus Re had lips and Triceratops had cheeks.
B．dinosaurs might have looked like mammals such as sheep.
C．dinosaurs might not bare looked like what we thought.
D．dinosaurs must have looked like birds or crocodiles.

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单项选择题

Which events provided much encouragement for Abraham Lincoln in his political career

A．The Black - Hawk war and Law - practicing.
B．The Black - Hawk war and the Missouri Compromise.
C．Farm work and Law - practicing.
D．Law -practicing and the Missouri Compromis

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