单项选择题

The passage focuses on ________.

A．dinosaur's geographical location.
B．shifting views of dinosaurs.
C．migration patterns of dinosaurs.
D．geologic activity of Earth.
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单项选择题
Newly- 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.
单项选择题
What was required of a teacher in the author's hometown
A．No qualification.
B．Latin - understanding.
C．Experiences of traveling round the world.
D．The basical ability to know how to read, write and compute arithmetically.
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